Develop Bugs

Battery Recalibration

So.... following Mikey1022's thread crusade, I'm almost hesitant to post this here, but I feel like I'm going to get the most accurate answer from the people in this forum vs general...
On Cyanogens site, I found this for Battery Recalibration:
Battery recalibration
If you're experiencing higher than normal battery drain, try the following:
1. Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2. Boot to recovery mode and go to console (or adb shell) and type:
mount -a
rm /data/system/batterystats.bin
NOTE: Newer Amon_Ra recoveries have an option to delete the battery stats, do this in place of the console commands above.
NOTE: To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for CM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue with this troubleshooter.
1. Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off.
2. Recharge the phone completely and then use as you normally would.
SO I'm at work, and don't have the option to check this, but unlike "hardware" battery calibration I'm mostly curious about removing the batterystats.bin
Would it help us with our battery woes, or do ours go deeper? For some reason, I noticed that mine's been draining a LOT faster in the past month or so then before...
Any thought?

This belongs in the general area?
I really don't think there's a magic forumula for these LIPO batteries. Unless you have a bad battery, you like numerous others need to join the battery 12 step program. I've already been through it. "Hello, my name is Sean and I'm obsessed with my battery life."
Long story short, just keep charge the battery when it gets low. If you work near an outlet or computer, and sleep near one - it's quite easy to keep the battery up throughout the day.

FYI, I've read up on this a bit regarding laptop batteries. It has nothing to do with the actual battery life or the "memory effect" (these batteries don't have a memory effect). It has to do with the OS's interpretation of the battery's performance and how it is reported to the user. So you're really recalibrating Android, not the physical battery. As far as I've read, this only "needs" to be done once in a great while, once a year maybe. Or if you notice something really odd with the battery level reporting.

I did this this morning as well since my phone was fully charged and ready to try it. Not had any hugely bad side effects from the phone and new battery (1750), but we will see if this changes anything.

wraithdu said:
FYI, I've read up on this a bit regarding laptop batteries. It has nothing to do with the actual battery life or the "memory effect" (these batteries don't have a memory effect). It has to do with the OS's interpretation of the battery's performance and how it is reported to the user. So you're really recalibrating Android, not the physical battery. As far as I've read, this only "needs" to be done once in a great while, once a year maybe. Or if you notice something really odd with the battery level reporting.
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Well, actually, that's why I put it in the development forum. These instructions are telling us to remove things from the system. Also on that note, my battery went from being at 30% full by 10pm (fully charged in the morning) to 30% full by 3pm (YES, 3) so something is definitely wrong, not just "I am obsessed with my battery life". Mind you, I'm at work until 2, so my phone drains to 30% on IDLE, with screen off. I was thinking maybe Android is misinterpreting something? I removed all programs that I thought might be causing this, turned off wifi, bt, gps, still no go. Maybe bad battery?

What I'm thinking this may help with is the fully charged issue the incredible has. I wouldn't follow the above instructions exactly however. Let me explain.
If you've ever noticed, the OS doesn't report "fully charged" correctly. Charge your battery to full (where both the green light comes on AND the "about phone" battery status says "Full". Now shut your phone off, you'll notice your light turns orange again, and will charge for about 30 minutes, sometimes more depending on how far off the battery is. If you turn on your phone after this, you'll notice you stay at 100% for quite some time. This is the case with a lot of incredibles from what I've seen... It probably has to do with the calibration notated above.
I would say do the calibration noted above, however, charge it the way I just noted (charge to full, shut the phone off, let it finish charging to full...). Then follow the rest of the steps immediately following. Might make a difference.
EDIT: this is probably even more true for the 1750mAh battery.

calibration and such has been discussed but not under its own name on page 3 i explain abit about the lithim ion battery vs nickel cadium.
http://forum.xda-developers.com/showthread.php?t=695472

junjlo said:
calibration and such has been discussed but not under its own name on page 3 i explain abit about the lithim ion battery vs nickel cadium.
http://forum.xda-developers.com/showthread.php?t=695472
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I was witness to that thread, and yes, you are correct, Lithium Ion batteries do not need to be conditioned, it is useless... However, we are not talking of conditioning, we are talking of proper reporting of battery life through the OS, which IS how Lithium Ion memory works. This is not saying to Cycle your battery 3 times to "condition" it to full potential. It is stating that the OS is not properly calibrated to report the proper life of the battery. If the OS cuts the charging of a Lithium Ion battery because it "thinks" it is at 100% charge, while the battery itself is at 80% (just a random example), then your battery life is going to appear to be shorter than it should. The example posted above would theoretically reset the OS so that when it says the battery is at 100%, it indeed is at 100%, preventing it from cutting a charge before it should. See my post previous post if you are confused. "Conditioning" is an entirely different animal, in which you "train" the batteries memory (in Nickel cad batteries) before utilizing your battery in normal charging operations. Lithium Ion does not have this memory, making "Conditioning" useless.

Moral to the Story here is to fully charge your phone when its off and you don't have to deal with any of these work arounds. Am I right?

buy a second battery and an external charger. I do this with every phone and I always seam to get battery life that is on the high side of what people report

Thank you for correcting that was bit early in the morning thought it was same question.
Sent from my ADR6300 using Tapatalk

I'm trying this and I've seen an improvement already on the stock battery. Been off charge for 8hrs and 13 mins and is still at 70% charge. Figures it holds a charge when you want to run it down!

jermaine151 said:
I'm trying this and I've seen an improvement already on the stock battery. Been off charge for 8hrs and 13 mins and is still at 70% charge. Figures it holds a charge when you want to run it down!
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What, exactly, are you trying that's giving the improvement? The OP's suggestion of booting into recovery and deleting battery stats, or the other common suggestion of turning phone off for the remainder of the charge? 70% after over 8 hours is FAR better than I'm seeing, and I'd like to see the same results.

alexdw369 said:
What, exactly, are you trying that's giving the improvement? The OP's suggestion of booting into recovery and deleting battery stats, or the other common suggestion of turning phone off for the remainder of the charge? 70% after over 8 hours is FAR better than I'm seeing, and I'd like to see the same results.
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I charged with the phone off, then went into recovery and deleted the battery stats file. Now I'm trying to discharge it completely.

jermaine151 said:
I charged with the phone off, then went into recovery and deleted the battery stats file. Now I'm trying to discharge it completely.
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I am doing the same. Will follow up with results in a few days.

alexdw369 said:
What, exactly, are you trying that's giving the improvement? The OP's suggestion of booting into recovery and deleting battery stats, or the other common suggestion of turning phone off for the remainder of the charge? 70% after over 8 hours is FAR better than I'm seeing, and I'd like to see the same results.
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That's awesome! That's great battery life. I might have to try this.
~ IRC: nostradamus ~

EM30996 said:
That's awesome! That's great battery life. I might have to try this.
~ IRC: nostradamus ~
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Trying it myself tonight. Will post results tomorrow.

I'm trying it to. I will post results.
Sent from my HTC Incredible using Tapatalk

Just tried this method, fully charging the phone when it's off then wiping the battery stats. Hoping it'll fix the annoying problem that the battery doesn't fully charge when the phone is on, although I'm not sure if it even can be fixed -- does anyone know?
I'll update if I remember next time I charge it.

Giving a try
Hey guys. I am also giving this a try today.
I just completely charged my battery last night with it off. This morning I unplugged the charger (while the phone was still off) and plugged back in to make sure that the battery was fully charged. The green light turned orange for a couple of minutes and back to green so I proceeded to boot to recovery and removed the battery file. I am also running a Seidio 1750mah.
I am now up and running. I will post later this afternoon to let you know how it's going.
If this fixes the weird battery bug where the Incredible doesn't charge fully, I will kiss the OP. Seriously.

[Q] Battery drain application

Hi!
I'm looking for an application, that quickly kills my battery if it's low, so I can do a full charge to improve battery life.
Something, that I launch, I put my phone on the desk, have a tea meanwhile, and it's drained! Something, that turns on wifi, do some downloading, browsing, video playing, or whatever, and does it automatically without supervision. Does such app exists?

I'll second this, it'd be nice to have an app do this for me and maybe even give us some interesting stats from it?
Sent from my mind using telepathy

why would you want an application to destroy your battery?

Adevem said:
why would you want an application to destroy your battery?
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Apparently if you do a full discharge the battery life will be longer.

Soniboy84 said:
Apparently if you do a full discharge the battery life will be longer.
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not really, you should avoid deep discharges...

Byr0x said:
not really, you should avoid deep discharges...
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+1 If you had been reading around...you would know Lithium Ion batteries are designed to 'maximize' their efficiency within about two weeks of 'top up' charging. Cycle-charging is generally considered a less efficient method of charging. You will need to 'TopUp charge' this means charging as much and as often as possible. If your battery is at 89% for instance and you find yourself near a socket, plug your adapter in and charge it up to 100%. After a few days of doing this you will notice an improvement in the life of your battery when you are not able to charge.

Actually,,,
It is not matter of running your battery down to 0%.
It is ok to run it down till phone does to power on itself.
As you know battery is a single cell Li-Ion @ 3.7v
when it is fully charged it's peak voltage is 4.2v
By the time battery mah is drained down (galaxy s has 1500mah)
battery voltage should be around 3.2~3.4v range. this will depend on condition of the battery.
Battery should never go below 3.2v personally, 3.4v is my cut off.
If your battery voltage goes below 3.2v... it's time for a new battery as this kind of voltage will damage your battery, either it will leak or puff (battery will actually get bloated.
Phone has a voltage cut off so it will not over charge over 4.2v but if it does, it will likely start to smoke and catch fire.
I am sure anyone who is into electric Radio control knows all about these batteries.
Oh btw,,, long time storage voltage should be 3.8v
You'll be asking how do I know what voltage my battery is... I personallly don't know of any apps but GPS Status actually shows the temperature & voltage of your battery.

Soniboy84 said:
I'm looking for an application, that quickly kills my battery if it's low, so I can do a full charge to improve battery life.
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Click to collapse
First, take into consideration the comments above regarding deep discharge of your battery...but, to answer your question, there's an app in the market place called 'Battery Refresh' which attempts to drain your battery quicker.

Well if it's all true above than its a good sign, and thanks for the info! I'm not an expert but in the old times I remember batteries had to discharged completely, maybe even if it's just a few times. Now somebody can also tell me why my battery is discharging when it's plugged in the socket with original charger? All I do is using the internet, and has. nimbuzz and a live wallpaper on. :S

You could probably enable the GPS/BT/WIFI ( connected to a router ) and run the interactive mode on Neocore benchmark.. that should enable most of the hardware components on the phone and stress the GPU/CPU.. probably would see a 25% battery drain for every 35-40mins.

I don't know what has changed with the batteries but as far as I know...
it is good to discharge new batteries 3~4 times down until phone does not power on.
Like I have said... it's about the voltage of the battery, not whether battery has any juice left in it or not.
These batteries have a protective circuitry so that it will not charge over 4.2v,
also as for discharge it is usually down to 3v but usually with a charger/discharger units that can control mah/volts/amps. With typical usage from the phone, it'll likely be discharged down to about 3.2`3.4v. Which is very safe.
You can do whatever you feel but I personally do this to every batteries I have for phone and every batteries I use with my radio controled cars.
For my RC cars, I have about 6 batteries ranging from 1cell to 3cell LiPo packs.
Each cell is 3.7volts.
But you don't have to force discharge and hurry the process.
Just use the phone normally and let it run down to nothing... than recharge to full peak.
Than again, choice is yours.

I'm looking for the same kind of applications. It's very useful for recalibrating your battery. Wipe the battery history then do a full cycle.
Sent from my GT-I9000 using XDA App

The old saying in RC Helicopters was that the difference between discharging 50% and 100% was the difference between getting 500 uses and 5 uses.
You should certainly avoid ever fully dischaging any lithium based battery.
Older nickel batteries (Ni-cd, Ni-MH) required full dischage cycles to get rid of memory the the metals pertained, lithium-ion and lithium-ion-polymer not only do not require this; but doing so will damage them.
And yes, the older ipods came with Nimh cells and they did reccomended full discharge cycles.
Im pretty sure the idea was to try not to let the voltage get below 3.5v/cell and never below 3.3. Dead flat is 3 or 2.85 which is when the battery simply cant produce any real current. The phone should have circuitry though to not let the voltage get above 4.25 or below ~3.5.. If the low battery warning comes on, set the brightness to dim, and stop any activities (unless its a phone call, its not THAT important but if youre playing games or watching a movie...) until yo can get to a charger.
By the way this being my first post (i meant to ages ago) Ill just mention that my galaxy S came with recovery mode and download mode Enabled, i got it just last month, Virgin network, Australia.

draining the battery fully was for the older battery types, new age batteries are not recommended to be drained fully

Thanks!
One more question:
I'm using my phone as a desktop replacement, because I don't have Internet at the moment. I'm using xda, dolphin browser and listening music. It's plugged into the mains and it's not charging. It says 49%, and stuck there. Is it possible I'm using too much battery?
Sent from my GT-I9000 using XDA App

Ok, this will be my last reply.
Fully draining or not is not the issue.
In RC, most modern electronic speed controllers have a built-in battery cut-off which will cut off power once it reaches certain voltage. Because OVER-draining battery without cut off can damage/kill/ or make it unable to hold voltage.
Also, once the battery voltage reach certain point (still within safe range) you will notice the motor being powered slow down. This would also be a recommended time to stop.
Cellular phones have built in safe cut off aswell. As I have said I have measured my battery after being full drained, voltage was around 3.55v or so. Which is very normal considering voltage of the battery is 3.7v only with peak charged voltage of 4.2.
Now, Someone mentioned that fully draining your battery repeatedly will dramatically reduce battery life.
Reducing life of the battery has more to do with the amount of AMP used to charge the battery. Faster charging is usually reduce battery life dramatically.
And without hobby grade chargers, you won't be able to control this charge rate.
Slow charge is better but charging at 1C rating is the normal. But charging at 1C means regardless of batteries mah rating, battery can be charged in about 60 minutes. As we all know, our phone batteries doesn't charge from zero to full in 60minutes, right? just like most of the portable devices it takes nearly 3~4hours to fully recharge. Last 20% usually takes longer because Amp provided to charge slowly lowers. That is why.
For example, if Galaxy S battery is 1500mah, than 1C charge rate is @ 1.5amp.
If battery is 3000Mah, 1C is 3.0Amps and so on.
So like I have said over and over before, drain your battery away if you have to by choice or not. Just use it up, I will bet you your battery will last longer than you keep your phone.

U should avoid draining ur battery to 0% (witch is not possible with ur phone. When it shows 0% the charge of the battery is at 10-15%). Li-ion batteries dont have a memory effect, so it would be usless discharching it completely anyhow. Best for sgs battery is charging it before it goes under 50% that will improve the lifetime of ur battery (not how long it lasts before u have to charge but how long it lasts before u have to go and buy a new one)
How do i know? Simply cause i had to learn that a few weeks ago for the job im learning.
@xxgg: yes ur right, it wont really damage the battery if u runn it till thr phone shows its empty. But using an app to drain battery as quick as possible will, since the app forces the battery to give out more Ampere than its built to give out
Sent from my GT-I9000 using Tapatalk

Best advice for sharging battery for first use out of box?

so what is the best thing to do?
is there any way of charging,dis charging ect to get the best battery life?
or should i just charg it to 100% and use it right away?
i did a charging squence with my nexus s. but duno about the Gn.

for me is to turn on the device and start working until the battery drops to 0-1%.
only then im charging it X2 then needed to go to 100%, you can make it Double if you want.

Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...

ericshmerick said:
Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
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100% Agree. There will be a lot of different opinions.
ericshmerick said:
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...
Click to expand...
Click to collapse
My way,
Turn on phone, charge it to 100%, leave it plugged for an extra 20 min, and start using it normally.
The only time I discharge a battery is after a couple of months. Because we never charge it to 100% and they start creating memory and charging less and less every time. The purpose of discharging it completely is to erase its memory. That's why when it is new, I see no point on discharging it completely. Batteries suffer every time they are completely discharged and if they are left 100% for a long period of time, thats why new batteries always come charged about 50%, to extend battery life since they may be stored for a long period of time. (ref. aviation school)
Just my 2 cents.

sstang2006 said:
The only time I discharge a battery is after a couple of months. Because we never charge it to 100% and they start creating memory and charging less and less every time. The purpose of discharging it completely is to erase its memory. That's why when it is new, I see no point on discharging it completely. (ref. aviation school)
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That hasn't been true since NiCd's in the 1980s.
Modern Lithium-Ion and Lithium-Polymer batteries have no "memory" and are actively damaged if allowed to discharge fully.

HooloovooUK said:
That hasn't been true since NiCd's in the 1980s.
Modern Lithium-Ion and Lithium-Polymer batteries have no "memory" and are actively damaged if allowed to discharge fully.
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OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)

sstang2006 said:
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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Generally because they don't know any better and they don't realise battery technology has moved on.

Because batteries "back in the days" were quite sensitive to memory. That's why we were all raised by the complete-discharge-mantra, which sticks with you forever. The next generation won't have this problem and will feel free to charge their phones when they want to. ;-)

sstang2006 said:
OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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Becouse android in itself keeps a battery log, it is from this log your device calculates the amount of battery you have left. To keep these values true (calibrated) you should do 2-3 cycles where you on purchase, discharge fully until device auto shut down, start it WITHOUT charge a couple of times and let it die to set the min value, charge up to 100%, use your device again till auto shut down... you dont have to worry about damaging your battery in this case since your device it programmed to shut down with good marginal of battery depletion. What you SHOULD NOT do is leave an empty battery uncharged for a long period of time.
Sent from my X10i using xda premium

Lithium batteries will be damaged if they are stored fully charged or fully discharged for extended periods of time. Thats why the battery is about half charged when its new. They have no memory effect, they just loose capacity.
Sent from my Nexus S using Tapatalk

Tjotte said:
Becouse android in itself keeps a battery log, it is from this log your device calculates the amount of battery you have left. To keep these values true (calibrated) you should do 2-3 cycles where you on purchase, discharge fully until device auto shut down, start it WITHOUT charge a couple of times and let it die to set the min value, charge up to 100%, use your device again till auto shut down... you dont have to worry about damaging your battery in this case since your device it programmed to shut down with good marginal of battery depletion. What you SHOULD NOT do is leave an empty battery uncharged for a long period of time.
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Good point. While it's important not to fully discharge the battery too often, there is also the issue of calibrating the battery meter.

ericshmerick said:
Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...
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That's exactly what I do, had 14 hours of moderate use today and still had 45% left. More than happy with that. It seems to be getting better each day at the moment.

Crin said:
That's exactly what I do, had 14 hours of moderate use today and still had 45% left. More than happy with that. It seems to be getting better each day at the moment.
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78% after 14 hours here, but that's light use.

sstang2006 said:
OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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The whole "discharging the battery fully" thing doesn't really apply here - because nobody will ever fully discharge it. The Nexus uses a Lithium Ion cell - it's a single cell, with a nominal voltage of 3.6V. When fully charged, it peaks at 4.2V (at which point, the charging circuitry cuts off to avoid overcharging). However, when we "fully discharge" our phones, the cell only goes as low as 3.5V - and then the phone shuts off.
In reality, lithium cells can discharge to around 3.0V before any damage occurs. However, this would yield very little extra battery life. Stopping at 3.5V provides a wide safety margin (lithium cells are potentially dangerous if overcharged/discharged), whilst extending cell life.
In a nutshell - don't worry about running your phone down to 0% (unless you're putting it in storage, in which case leave it at about 60%). In fact, it's a good thing with a new phone, as cycling (charging and discharging a cell) helps to "wake" the cell up and reach it's max capacity more quickly.
Sent from my Galaxy Nexus using XDA App

i see some good ideas about charging and discharging.
but it is indeed a fact that 100% and 0%(real) isnt good for our new race of battery's.
but a few posts here already tell how and what.
and its not gonna be a thread of arguments and stuff,if we all keep it in our heads that we just want to share our tip's of how you think its the best way(and have some experience with it)
just to share some info. and not compete the info against each other.
i well know there are different ways. but its always nice to read what experience people have with it to make a choice for my own and any other wanting to know this.
and i posted here in the GN section,instead of the Android section because each phone handles battery different,and this narrows the options down to a single device :3

Just keep in mind it's not just about the battery itself it's about the software registering how much actual power the battery has at a certain time, so if the battery has in actuality 100% charge in it, and the software reads 80 then your phone will die out sooner. So charging and discharging is good because it calibrates the hardware with the software. Just remember to switch off the device then charge it so the software doesn't auto discharge when it thinks the battery reached 100%.

K i just skipped thru the posts, gonna throw in my input real quick.
Basically just run down the battery. Once it turns off, hold the power button to make sure all the juice is gone. Then charge it up to 100% and leave it there for a good hour. Now (root required) download https://market.android.com/details?...yLDEsImNvbS5uZW1hLmJhdHRlcnljYWxpYnJhdGlvbiJd and follow the instructions .. its not exactly necessary but a nice thing "just in case" .
thats my plan anyways.

Nutsonfire said:
Lithium batteries will be damaged if they are stored fully charged or fully discharged for extended periods of time. Thats why the battery is about half charged when its new. They have no memory effect, they just loose capacity.
Sent from my Nexus S using Tapatalk
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Where does the loosed capacity go? Can it be caught?

And what do you think about charging with the phone being switched on? Is it better to have it switched off?
Sent from my Galaxy Nexus using xda premium

juniorbattle said:
And what do you think about charging with the phone being switched on? Is it better to have it switched off?
Sent from my Galaxy Nexus using xda premium
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Won't make a difference.. Phones are designed to be left on anyway.

[Q] First time battery charging

Hello,
So I am going to get HTC One X next week. Though, I have one question. Should I charge it first time for a long period or can I turn it on in shop, just to check if everything is okay and etc. I just want to have the maximum battery life, possible. Thanks for your answers
And hey, maybe you have any other suggestions?

I would get it home and stick it on charge until at least the light turns great. A few people are suggesting leave it for at least another 20-30 mins after this too if you can. I definitely wouldn't turn it on in the store; and HTC also recommend to fully charge before use.

DazNoonan said:
I would get it home and stick it on charge until at least the light turns great. A few people are suggesting leave it for at least another 20-30 mins after this too if you can. I definitely wouldn't turn it on in the store; and HTC also recommend to fully charge before use.
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Oh, okay Thanks. Well, I am just so scared... I don't want to get a phone with bunch of bugs

You're fine to turn it on and give it a quick test. All Lithium Ion/Polymer batteries have a partial charge for shipping as leaving it completely flat for long periods of time will damage it. Don't run the battery down though.
You should still charge it fully before using it properly however. Once the phone is fully charged then you can unplug it and use it. You don't need to leave it "charging" for 12+ hours even if the phone thinks it is fully charged.

Tiersten said:
You're fine to turn it on and give it a quick test. All Lithium Ion/Polymer batteries have a partial charge for shipping as leaving it completely flat for long periods of time will damage it. Don't run the battery down though.
You should still charge it fully before using it properly however. Once the phone is fully charged then you can unplug it and use it. You don't need to leave it "charging" for 12+ hours even if the phone thinks it is fully charged.
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Okay, I will plug it in for the first time. But what about second, third times? Should I discharge it completely?

Niiceg said:
Okay, I will plug it in for the first time. But what about second, third times? Should I discharge it completely?
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Its normally better for the battery to run down to a low level before re-charging if you keep topping the battery up when it gets to 50 - 60 you could end up damaging the battery.

Appsdroid said:
Its normally better for the battery to run down to a low level before re-charging if you keep topping the battery up when it gets to 50 - 60 you could end up damaging the battery.
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That is with NiCad and NiMH batteries. Lithium Ion batteries don't have the memory effect and actually prefer partial discharge cycles.
If anything odd happens then you can recalibrate the battery monitoring data by discharging it fully then charging it. In general however, you shouldn't do this every cycle.

My second phone that arrived took around 3 hours 15 mins for its charge light to turn green; I unplugged it after 4 hours and I was actually happy with the battery life on that one. My third one arrived earlier and the green light came on after 1 hour and 25 mins.
Guess they started with different battery levels? I will leave it on charge for another hour or so as I'm going in a meeting anyway; therefore when I turn it on its initial charge will have been around 3 hours long.
I believe you can't over charge the battery anyway, so once the green light it on there is a chance its probably not taking in anymore power. If thats the case leaving it plugged in once the light has changed is just irrelevant?

DazNoonan said:
I believe you can't over charge the battery anyway, so once the green light it on there is a chance its probably not taking in anymore power. If thats the case leaving it plugged in once the light has changed is just irrelevant?
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Li ion batteries are protected from overcharging, as overcharge could actually cause it to overheat and catch fire or explode. Not sure if the protection is in the OS, hardware, or battery. But basically charging will stop when the battery is 100% and saturated, then when the battery dips below 100%, it will top it off again. Not sure about the One X (still waiting for the AT&T variant), but on other HTC phones, you will sometimes actually see the battery meter drop down from full to 99% when its on the charger, then read full again.
So leaving it on the charger doesn't hurt things much (although technically partial charges are better for the battery long term). Leaving the battery charging for longer ensures the "saturation" charge is applied, which may not happen if you quick charge to full, then disconnect.
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
---------- Post added at 01:04 PM ---------- Previous post was at 12:52 PM ----------
Tiersten said:
If anything odd happens then you can recalibrate the battery monitoring data by discharging it fully then charging it.
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You shouldn't purposely discharge Li ion batteries until the phone shuts off. In theory, protections in the OS and the battery's safety circuit are supposed to prevent over-discharge. But its not fail-safe, and I've seen reports of plenty of Android phones where the battery fails to take a charge after being discharged to shutdown. If this happens to you, the only way to bring the battery back to life is with a special battery meter with boost function (which most people do not have access to) or buy a new battery (which is of course a problem on the One X, due to the non-removable battery).
Its rare, but it does happen, and there is no real benefit to running the battery until the phones shuts down. The battery meter is not remotely accurate enough to justify purposely discharging below 10 or even 15%, just for sake of calibration. Charge to full, leave it a while (30 min), then use until 15% charge or so. Repeat a couple times to fully calibrate the battery meter.
To answer the original question, powering the phone on (when you first get it) for a short time is ok. Just go through the battery meter calibration as I described as soon as possible thereafter, and it should be fine.

redpoint73 said:
Li ion batteries are protected from overcharging, as overcharge could actually cause it to overheat and catch fire or explode. Not sure if the protection is in the OS, hardware, or battery. But basically charging will stop when the battery is 100% and saturated, then when the battery dips below 100%, it will top it off again. Not sure about the One X (still waiting for the AT&T variant), but on other HTC phones, you will sometimes actually see the battery meter drop down from full to 99% when its on the charger, then read full again.
So leaving it on the charger doesn't hurt things much (although technically partial charges are better for the battery long term). Leaving the battery charging for longer ensures the "saturation" charge is applied, which may not happen if you quick charge to full, then disconnect.
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
---------- Post added at 01:04 PM ---------- Previous post was at 12:52 PM ----------
You shouldn't purposely discharge Li ion batteries until the phone shuts off. In theory, protections in the OS and the battery's safety circuit are supposed to prevent over-discharge. But its not fail-safe, and I've seen reports of plenty of Android phones where the battery fails to take a charge after being discharged to shutdown. If this happens to you, the only way to bring the battery back to life is with a special battery meter with boost function (which most people do not have access to) or buy a new battery.
Its rare, but it does happen, and there is no real benefit to running the battery until the phones shuts down. The battery meter is not remotely accurate enough to justify purposely discharging below 10 or even 15%, just for sake of calibration. Charge to full, leave it a while (30 min), then use until 15% charge or so. Repeat a couple times to fully calibrate the battery meter.
To answer the original question, powering the phone on (when you first get it) for a short time is ok. Just go through the battery meter calibration as I described as soon as possible thereafter, and it should be fine.
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Brilliant post redpoint73; appreciate you taking the time. Just got out of my meeting so my device has been on charge for around an extra hour since seeing the green light so I will be taking it off charge now to set it up etc... Total first time charge time will have been 2 hours 40 mins.
It's likely it will be down to 15%-20% before I put it on charge again tonight as will be syncing all the apps and data back on to the device as well as giving it a good bit of usage to check things out. Will no doubt then be on charge for around 7 hours through the night whilst turned off, and I will do this for the first 3/4 days (same as previous one). My last battery was good so hoping for the same again.

redpoint73 said:
You shouldn't purposely discharge Li ion batteries until the phone shuts off. In theory, protections in the OS and the battery's safety circuit are supposed to prevent over-discharge. But its not fail-safe, and I've seen reports of plenty of Android phones where the battery fails to take a charge after being discharged to shutdown. If this happens to you, the only way to bring the battery back to life is with a special battery meter with boost function (which most people do not have access to) or buy a new battery (which is of course a problem on the One X, due to the non-removable battery).
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It is pretty poor design if your phone does kill itself if you hit 0% though as that isn't too unusual of an event for a phone. I've never seen any phone which did that but I agree it could happen.

after doing a full discharge and a recharge

After doing a full discharge and a full recharge. My battery is doing amazing. I don't know if I should be doing this every day? What do you guys think. I thought it was April 5th update but it was not. Any suggestions?

bradmill08 said:
After doing a full discharge and a full recharge. My battery is doing amazing. I don't know if I should be doing this every day? What do you guys think. I thought it was April 5th update but it was not. Any suggestions?
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You basically let the system calibrate the battery, which I do as well from time to time. I typically go to about 20% then charge to 90-100% Seems to work fine for me :good:

bradmill08 said:
After doing a full discharge and a full recharge. My battery is doing amazing. I don't know if I should be doing this every day? What do you guys think. I thought it was April 5th update but it was not. Any suggestions?
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Badger50 said:
You basically let the system calibrate the battery, which I do as well from time to time. I typically go to about 20% then charge to 90-100% Seems to work fine for me :good:
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I must admit, I still do this every now and then. Though it's up for debate as to the necessity to do it, but my OCD tells me too - especially after flashing a new rom. I'll then let it fully discharge, reboot a couple times until its completely empty, give it a full uninterrupted charge then use a battery calibration app to wipe clean the battery stats app. As mentioned, there'll be some people (rightly or wrongly) who'll disagree with this method with arguments saying that its bad for the battery and/or that the android system is intelligent enough to handle this by itself, which may indeed be true (e.g. perhaps not supposed to drain fully at risk of this being bad for the battery etc.). Though having saying this, I not only feel better for doing so but I, across many devices with this Pixel 2 XL included, experience great battery life throughout the lifespan of me having it.

I don't use any battery calibration apps or anything I don't root my phone at all. I used to do rooting but with stock Android it works awesome without rooting in my opinion.

Wow my phones battery life is amazing now after letting it completely die and charge back up. I am at 90% after almost 6 hours!

Isn't this a bad practice for battery health?

Prattham said:
Isn't this a bad practice for battery health?
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Yeah, it's not recommended to let Li-ion batteries drain completely too often or keep them charged at more than 80-85% for extended periods of time without using them. That's pretty much the reason why phones aren't fully charged when you buy them.

Hi
Battery technology and charging circuits are pretty advanced these days that it should not make any difference doing a full charge cycle, which if anything is not good for the battery. The battery capacity with lithium chemistry is mostly measured by voltage, it's not very precise at full capacities, but as the battery level falls it becomes a more reliable indicator.
I suspect all that is happening is on a full charge cycle, the stresses involved to the battery and effort of the charging circuit pushing a high current into it, is causing the battery voltage to peak higher and remain a bit higher whilst it is full. This has the side effect of causing the battery gauge to read higher for longer, however it will simply even out and drop more quickly as the battery capacity falls, the end result is it doesn't run for any longer, put just feels like it is doing better as the top end of the gauge isn't reading a drop quite as quickly.
The other thing that can cause a seemingly better battery drain is at what time we disconnect the charger when it reads 100%. Typically it will read 100% before it has actually finished charging. This happens as to get from a real capacity of say 90% up to 100% takes a longer time, and it's all about the impression of fast charging these days. Also when the phone is left charging, it will charge and then discharge, then top up, then discharge until its off the charger, as you can't leave the battery continuously trickle charging, and so that it doesn't look broken if we've left it on charge all day and it only reads 95% because a couple of hours ago it stopped charging and is in a run down phase before topping up again, the gauge is set to read 100% even if it is lower.
In other words there is extra capacity in the battery above what we are told is 100% and depending on when we take it from the charger, we might have 105%.
Regards
Phil

Thank you all for your answers! They are really helpful