Develop Bugs

Strange Battery behavor

ok my battery has good days and bad days. I have now tried something different and it seems to have worked for me. When I wake up in the middle of the night and the light is green i unplug my phone from charger. Then when i wake up four to five hours later it is usually around 95%. In the past I let it charge till I woke up then I would send a text or two a quick call or check email and it would drop to 88% or 90% in minutes. But now that I leave it unplugged for about five hours I get up and do what I usually do and battery doesn't seem to drain as quick. My question is why does this happen???? Strange that before it would go from 100 to 90ish real quick. now i start off at 95% and battery drains slower.

My battery is absolutely horrible. I unplugged it today n within minutes it was down to 93% n i didnt even use it at all. I have GPS turned off, wifi is off, 4G is off, friendstream is gone, i have everything set up to sync manually so idk wat the deal is.

If you are running a custom Rom you should do a search in the dev section for how to calibrate your battery.

it is stock rom. I have tried every battery trick. you could think of even the one someone posted from htc. none have work but for some reason this seems to be giving me better battery life. and i am just wondering why and sharing for other people to maybe try.

nothing new under the sun. a search would have revealed the following posts...
http://forum.xda-developers.com/showthread.php?t=701567
http://forum.xda-developers.com/showthread.php?t=712990
it sounds like voodoo, but based on the battery graphs before and after...it worked for me. the upgrade to 1.47 and 2.5 baseband seemed to help quite a bit too.

Strange battery design
OK it seems odd that the EE's who designed the phone specified a 4.2 volt charging cut off to the battery, and a 3.5V battery. It was probably to limit the heat production by components regulating internal voltage.
SO we can either up the charging cut off by rewiring a charger to use the feed but not the sensor ( 4 tabs on a battery), or get a battery rated a a slightly higher voltage ( which would only be partially charged due to the HTC charging algorthym). It may be that the recycling on /off specified by HTC ignores the sensor reading.

[Q] Weird battery discharge

Hi fellas..
Maybe you've noticed the messages I've sent to Unofficial BravoS thread of Coolexe's (http://forum.xda-developers.com/showthread.php?t=1200517&page=51) which is the ROM I use.
The issue is, the battery discharges rapidly. Actually, if you check mV values, it doesn't discharge rapidly, but if you look at percentages, there is a huge inconsistency. I used Battery Monitor Widget to log the battery performances last night, and saw these horrible results:
Code:
2011/09/19|04:59:49|-515mA|37%|3581mV|40.2ºC|1|0
2011/09/19|05:00:51|-465mA|36%|3576mV|40.2ºC|1|0
2011/09/19|05:01:49|-460mA|36%|3576mV|40.2ºC|1|0
2011/09/19|05:02:50|-462mA|35%|3517mV|40.2ºC|1|0
2011/09/19|05:03:49|-477mA|35%|3517mV|40.2ºC|1|0
2011/09/19|05:04:50|-471mA|34%|3449mV|40.3ºC|1|0
2011/09/19|05:06:06|-478mA|0%|3415mV|40.5ºC|1|0
2011/09/19|05:06:08|-478mA|0%|3415mV|40.5ºC|1|0
These are the last lines of the log, before the phone shuts down. As you can see, the phone gone to 0% from 34% in one minute! No low battery warnings or whatsoever..
Funny thing is, this doesn't happen in StarBurst ROM (which is a Froyo based one). Do you reckon this is a GingerBread issue or something? I saw some other people complaining about their phone shutting down at 20% as well.
So, what do you suggest?

when you look at the voltage there isnt that much drain, so its only a displaying problem
wipe battery stats and maybe recalibrate the battery
but first one should fix it
cheers
ps: i just checked, my desire is at 18% with 3.693mV, now you see the differance

crendot said:
when you look at the voltage there isnt that much drain, so its only a displaying problem
wipe battery stats and maybe recalibrate the battery
but first one should fix it
cheers
ps: i just checked, my desire is at 18% with 3.693mV, now you see the differance
Click to expand...
Click to collapse
This is what I've done so far:
Drained battery to 0% (log above) and charged it a little bit while powered off (like 20%). Turned on the phone, and obtained those logs (last lines only):
Code:
2011/09/19|14:41:25|-268mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:42:25|-267mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:43:25|-270mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:44:25|-269mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:45:25|-267mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:46:25|-268mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:47:25|-266mA|8%|3644mV|38.1ºC|1|0
2011/09/19|14:48:25|-267mA|8%|3644mV|38.1ºC|1|0
2011/09/19|14:49:25|-269mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:50:25|-267mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:51:25|-266mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:52:25|-267mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:53:25|-267mA|6%|3640mV|38.0ºC|1|0
2011/09/19|14:54:25|-267mA|6%|3640mV|38.0ºC|1|0
2011/09/19|14:55:25|-267mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:56:25|-266mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:57:25|-267mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:58:25|-268mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:59:25|-268mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:00:25|-319mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:01:25|-268mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:02:25|-270mA|3%|3610mV|38.1ºC|1|0
2011/09/19|15:03:25|-269mA|3%|3610mV|38.1ºC|1|0
2011/09/19|15:04:25|-270mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:05:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:06:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:07:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:08:25|-289mA|1%|3513mV|38.3ºC|1|0
2011/09/19|15:09:25|-290mA|1%|3513mV|38.3ºC|1|0
2011/09/19|15:09:51|-290mA|0%|3464mV|38.3ºC|1|0
It seems more "smooth" discharge now. Right now, I'm charging my phone off; going to turn on phone once it reaches "green light" with charger on, and plug it off once phone booted. Maybe then, it can know what's maximum and minimum.
So far, I tried to charge my phone to full and erase batterystats.bin but, as you can see at the first post, it didn't work well.. On the other hand, the phone charged-discharged only once in this ROM, you think it could be better if I've given a "second chance"?

i dont know much about that "battery calibrating" and reseting stuff, you have to search in the forum
only thing i want to say is, dont do that deep drains!
recharge at least 5%! you kill your battery, lithium-ion batterys get serious damage from deep drains

crendot said:
i dont know much about that "battery calibrating" and reseting stuff, you have to search in the forum
only thing i want to say is, dont do that deep drains!
recharge at least 5%! you kill your battery, lithium-ion batterys get serious damage from deep drains
Click to expand...
Click to collapse
I know, but when phone thinks it's 30% and not warn me, how can I do it?

In order to calibrate the battery meter - FYI the battery itself cannot be calibrated, as Li-Ion batteries have a very low memory compared to old Ni-Cd etc. batteries - you have to go through the following procedure:
1) charge the battery to 100%;
2) let the battery discharge until the phone shuts itself down;
3) plug the wall charger into the phone, boot the phone up then charge the battery to 100% without interruptions.
If the above procedure does not yield the expected results, you can try fully charging the phone (LED showing green) with it completely turned off (after completely draining it). Again, the charging procedure should not be interrupted.
Source: personal experience - had to do this twice after installing new ROMs, as the phone was shutting down at ~14% (working like a charm now).
Regarding the matter of battery wear because of complete discharges, Li-Ion batteries do indeed have a lower cycle count than old-school batteries, but the standard charge/discharge number a Li-Ion battery can take is ~350, so you can't damage the battery pack by doing a full cycle per month (required to keep the battery meter accurate).
Good luck!

TVTV said:
In order to calibrate the battery meter - FYI the battery itself cannot be calibrated, as Li-Ion batteries have a very low memory compared to old Ni-Cd etc. batteries - you have to go through the following procedure:
1) charge the battery to 100%;
2) let the battery discharge until the phone shuts itself down;
3) plug the wall charger into the phone, boot the phone up then charge the battery to 100% without interruptions.
If the above procedure does not yield the expected results, you can try fully charging the phone (LED showing green) with it completely turned off (after completely draining it). Again, the charging procedure should not be interrupted.
Source: personal experience - had to do this twice after installing new ROMs, as the phone was shutting down at ~14% (working like a charm now).
Regarding the matter of battery wear because of complete discharges, Li-Ion batteries do indeed have a lower cycle count than old-school batteries, but the standard charge/discharge number a Li-Ion battery can take is ~350, so you can't damage the battery pack by doing a full cycle per month (required to keep the battery meter accurate).
Good luck!
Click to expand...
Click to collapse
Thanks for your answer...
Today I realized that it my concern was a quick one. Today, I discharged battery to 0 percent, plugged the AC charger while it's OFF and charged it for around 2h22m until Led-green-full; then turned on the phone with charger plugged and plugged it off just after the boot process. After that, I let the phone to discharge (I helped it a little )
I actually saw "Plug your charger" warning this time, and according to Bat. Mon. Widget, it gone down until 13%! If I do compare the mV values with the old ones, I can see that somehow the phone does learn which mV value correspond to which percentage better.
Even though it gone from 13% to 0% in two minutes, it's at least better than 30% to 0%.. Also, when I check the readings after I plugged in, I saw that percentage-voltage matching is slightly higher, showing that the phone now shows lower percentage for the same voltage - which shows that it learns percentage better.
After one or two charge-discharge cycle, I think it'll learn absolute 0
BTW; the battery says 3.4V 1400mAh and my maximum voltage is 4160mV (100%) and minimum is 3415mV (0%). Are these values normal, you think?
PS: What I'd recommend from anyone who loves flashing ROMs as much as I do is: AFTER YOU FLASHED A NEW ROM, CHARGE YOUR BATTERY TO FULL (100%) AND ERASE THE BATTERY STATS. AFTER THIS, NEVER, I SAY, NEVER ERASE YOUR BATTERY STATS FOR LONG TIME IN ORDER FOR YOUR PHONE TO LEARN STATS BETTER! Erase after long time, say 3 months for wear effects to be accounted, but well, I think you should be fine even after you don't do this
Maybe you did already know that, but, well, I learned it hard way
EDIT: Phone shutdown at 13% after this, but I think it'll do better in time..

Can't Calibrate the Widget
I am having a similar issue with my htc aria. Problem is that it gets to about 78% and then won't go any higher. It even shows (in Battery Monitor Widget)
"Discharging" and "AC plugged". I have let it sit plenty long enough to be fully charged and then completely discharged it (until it shut itself down, which was not 0%) and recharged until it reaches 78% again and stops charging. I'm guessing it is so far out of whack that it says I'm at 78% but I am really at 100%.
The widget says to charge to 100% and then drain completely to 0% to calibrate. I can't do either from what I can tell. So what to do?

theGanymedes said:
Today, I discharged battery to 0 percent, plugged the AC charger while it's OFF and charged it for around 2h22m until Led-green-full; then turned on the phone with charger plugged and plugged it off just after the boot process.
Click to expand...
Click to collapse
Quick tip - let the phone charge for another hour or so after the light goes green (when charging it while powered off). I've read that the light goes green at about 95%. It takes another hour for the phone to really charge to 100%. That's because Li-Ion batteries use two stages to charge: a fast one and a slow one. More details here.
Glad i could help.
P.S. - It also took me two complete charge/discharge cycles to fully calibrate my battery meter after switching from FroYo to Gingerbread.
@vkyjackie - Try fully charging the phone while powered off. If it still doesn't fully charge (LED green), then you might have an issue with either the battery pack or the wall charger.

doze at night

My doze doesn't seem to be activating at night. Moto display turned off. I'm losing about 10% while sleeping which seems like a lot considering my s8 plus lost about half that with always on display on...

I'm also losing about 7% per hour and getting about 3hrs screen time per charge. I noticed a decrease in efficiency possibly after buying and using the Incipio wireless charging battery moto mod.

You can't judge battery drain from 100-90% once it goes below 88% that is when you get true readings. If you unplug your phone at the high 90's the charging algorithm could have had it at 92% and over those hours it just equalized itself.
I.E. I had my phone at 99% charge on the charger for an hour or two while using. The phone will still show 99% but the battery isn't getting a trickle to stay at 99% it will not get power and drop to roughly 91-93% depending on kernel then charge back up to help battery longevity but the system will still show 99% to not make the average user freak out over their battery level dropping while charged. There was a in depth post about this years ago on this site. Too lazy to search and post, but it is a simple search.
Edit: here you go, found it. It's a great read.
https://forum.xda-developers.com/showthread.php?t=871051

It is a good read but not really what I am talking about. I never leave my phone on my charger at night. I charge to 100% before I go to sleep and sometimes I use for hour or two before bed. So the drain I am experiencing can't really be related to a false reading due to changing currents after a long time on the charger. Sometimes it's down to 70-80% by time I go to sleep and I am still losing that amount in drain. Dozing doesn't appear in my charts at all at night so it appears the phone is never truly dozing... But hey, I'm not a genius about all this, I just know it's not dozing and my cycles in gsam suck for an 835 processor phone even taking into account the smaller battery.

My buddy just made a good point... If I am sleeping with the battery mod connected, even if it's not "charging" maybe the connection makes the phone"think" it's charging and not doze? I'll have to test that tonight.

Chrisy8s said:
My buddy just made a good point... If I am sleeping with the battery mod connected, even if it's not "charging" maybe the connection makes the phone"think" it's charging and not doze? I'll have to test that tonight.
Click to expand...
Click to collapse
That makes sense and I was just going off the image showing 100-92 drain. I wouldn't have a mod on if you're not using it, it can cause drain.

Battery charge issue...

Phone was at 98% battery. Did a reboot as I do every morning, and when it started up again it showed 91% battery. I know reboots don't take 7% battery, so what gives?

My Pixel 2 XL has been having some battery reporting issues, I noticed that when I took my phone off the charger it would lose 15% very quickly then stabilize. Rebooting would also cause a drop in indicated battery %. That's my guess. Investigating to see if it can be fixed by doing a full charge/discharge cycle.

2ndammendment said:
My Pixel 2 XL has been having some battery reporting issues, I noticed that when I took my phone off the charger it would lose 15% very quickly then stabilize. Rebooting would also cause a drop in indicated battery %. That's my guess. Investigating to see if it can be fixed by doing a full charge/discharge cycle.
Click to expand...
Click to collapse
I've also been seeing this issue! I will also be letting it do a full cycle today to see if it helps since it only started a few days ago.

My battery seems to be okay but my charge port when I place the cable in it doesn't feel like it fits snugly it almost has a slight wobble to it. Have you guys been noticing that as well?

I've actually been experiencing this as well for a week, I called up Verizon and they shipped me a new phone. So far no charge issue anymore on this one.

I have experienced this too

Tested this again this morning. Had the phone charging overnight.
Unplugged it, it showed 100% battery.
Immediately rebooted, and it dropped to 96%.

With a lot of phones, battery stats reset on reboot. Also- the percentage isn't a perfect science. Just let the phone do its thing. Run the battery down and recharge it. No need to reboot the thing every day.
The battery has been great for me. I use my phone extensively throughout the day, maybe 3-5 hours on time, I always make a day of use without needing to plug in. I had a light use day yesterday, and had 30% left @ 11pm, after pulling off charge the night before @ 11:30pm.

Pleased to announce that (in my case at least) doing a full cycle reset the fuel gauge and it is now working properly. I've never seen a device come with a miscalibrated fuel gauge from the factory, so that was odd. I usually keep my li-ion powered devices between 80% and 30% SoC(state of charge) to reduce cell degradation so we'll see if the fuel gauge becomes uncalibrated over time (which would be somewhat unusual) or if this was simply a software fluke.

Yea I have noticed that in my case, my phone says 100% on the charger so I will restart the phone while still plugged up and once it's booted back up it says 98% so it lost 2% while hooked up to the charger lol. Doesn't seem to affect the battery life. I'm still able to get 5 hrs of screen on time but I will try to kill it completely and charge fully today and see if it fixes it.
This morning I didn't do the restart and didn't use the phone or even turn my screen on and within fifteen minutes I turned it on to 98 % remaining.

Is this battery behavior normal?

I've noticed that my 2 XL battery drains very fast after full charge, but then settles to acceptable drain rates from about 90%. I'd say it takes less than an hour to drop from 100 to 90% without basically any use. Often I can't even hit 100% when charging. More like 99/98% max. If it does charge to 100%, it stays there for a couple minutes tops, even if just on standby. Which leads me to my next issue...
This prompted me to calibrate my battery which seemed to help somewhat, but I found that I cannot monitor the charge rate when charging while the device is turned off. What is shown is just what "looks like" a full battery charged icon at all times, and the screen does not dim at any point during charge. It actually seems that the phone is frozen during charging when turned off, and needs a very long power button press to turn the phone on. I actually have two Pixel 2 XLs in front of me and they both do this! Is this a known issue?
In general I am getting 5-6 hours screen-on time per charge which seems about right from what I've read. But that initial fast drain and "freezing" while charging when turned off is puzzling. Any common experiences or insight?

nobaddreams said:
I've noticed that my 2 XL battery drains very fast after full charge, but then settles to acceptable drain rates from about 90%. I'd say it takes less than an hour to drop from 100 to 90% without basically any use. Often I can't even hit 100% when charging. More like 99/98% max. If it does charge to 100%, it stays there for a couple minutes tops, even if just on standby. Which leads me to my next issue...
This prompted me to calibrate my battery which seemed to help somewhat, but I found that I cannot monitor the charge rate when charging while the device is turned off. What is shown is just what "looks like" a full battery charged icon at all times, and the screen does not dim at any point during charge. It actually seems that the phone is frozen during charging when turned off, and needs a very long power button press to turn the phone on. I actually have two Pixel 2 XLs in front of me and they both do this! Is this a known issue?
In general I am getting 5-6 hours screen-on time per charge which seems about right from what I've read. But that initial fast drain and "freezing" while charging when turned off is puzzling. Any common experiences or insight?
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It may be that the battery is not fully charged when the phone is telling you it is 100%. When using Accubattery to manually benchmark the battery, I found that my phones were still taking a low charge current (as measured by AB) for 45 minutes to sometimes even one hour after the phone was reading 100%. AB will register 100% when the phone's charging circuit cuts off to zero (and notify you). Using AB for a while will also give you a very close approximation of the remaining capacity of your battery relative to a new battery. When my 2XL was new, I was getting just over 100% (~103%). A year later, it is in the high 90's.

Thanks for the tip on Accubattery. I am going to give that a try for a while. So have you been charging up to 100% regularly in spite of what's recommended by this app?

nobaddreams said:
Thanks for the tip on Accubattery. I am going to give that a try for a while. So have you been charging up to 100% regularly in spite of what's recommended by this app?
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Yes, I turn the 80% alarm crap off and leave it on the charger all night. It is fully charged before I go to bed but I leave it on the charger all night. I use AB for bench marking my battery's capacity and it's real good at that... if you start from when AB says your battery is full. You will see it converge to a % capacity after only 2-3 full discharges. I'm just guessing but I think you are not completely filling the battery to it's full capacity. At least using AB for a while will a) provide you with your battery's true capacity wrt a new battery, and b) will rule out you not charging up fully as your mystery 100-90% quick-drop. Please do report back. :good: