Battery doesn't reach 100% - Samsung Galaxy Nexus

Hey guys I just want to ask how can fix this.
My battery doesn't make it to 100% now
I plugged it in at around 1 late late last night, and took it off at around 6 this morning.
I've noticed it doesn't make it to 100% anymore it only goes up to 99%
And in the lock screen it only says 99% it doesn't even say "charged"
So is there a fix to this?
Thanks in advance.
JellyBeaned from my Nexus S

It does with me. On stock. Since you're using a custom rom, it could be from that.
If it still happens on stock... well, maybe start looking into cleaning the usb port, other charger, other battery...
What is it with people and 100% and "Charged." ? Your battery NEVER reaches its full capacity, for best battery life span. The OS is made to make you think so.

bk201doesntexist said:
It does with me. On stock. Since you're using a custom rom, it could be from that.
If it still happens on stock... well, maybe start looking into cleaning the usb port, other charger, other battery...
What is it with people and 100% and "Charged." ? Your battery NEVER reaches its full capacity, for best battery life span. The OS is made to make you think so.
Click to expand...
Click to collapse
its like signal bars, just placebo so the average user has something to gauge by

Related

Battery Question (NOT a complaint, for once)

Hey all
So I, personally, don't have such an issue with the battery like other people. I'm coming from a near 2-year old G1, and i think the battery life and performance on the EVO is better, so i'm generally cool on this front.
But here's my curiosity question...
I'll charge up this badboy to 100% overnight.
When i take it off the charger, it dips down from 100% to about 95% in a matter of about 5 minutes.
After that, it's cool and lasts a while, so it evens everything out for me.
But i'm just curious as to why i have an almost instant 5% drop when i take it off the charger? Where does the 5% instantly go?
The Evo isn't topping the battery off, that's all.
I think I *might* know a solution, I believe I saw the phone stores battery "calibration" or something like that. I'll look into it eventually.
I had the same problem until I tried the trick I found here http://forum.xda-developers.com/showthread.php?t=701567
After doing this my battery doesn't plunge when I take it off the charger, the only thing im not sure about is how often this trick needs to be done, hope that helps.
Akulamenuri said:
I had the same problem until I tried the trick I found here http://forum.xda-developers.com/showthread.php?t=701567
After doing this my battery doesn't plunge when I take it off the charger, the only thing im not sure about is how often this trick needs to be done, hope that helps.
Click to expand...
Click to collapse
I've done this and for me it helped a lot.

[Q] Can't get a full charge!

Hey Folks, Just wondering if there are any other G2 users out there that have experienced this. For some time, I haven't been able to get my phone charges fully, and by fully, I mean something close to the reported norm of 97%-100%.
The hightest I got my phone was to 81% and that with a new battery, recalibration, and bump charging. In fact, I've had the phone powered off over night and upon restarting it, it was at 71%.
I've watched logcat to see if anything could be an issue there, I've installed ZDBox, (cool app, btw), and Battery Dr. The good news, is that after uninstalling a few apps and widgets, my battery life seems prolonged, (relatively speaking).
I'm running CM-7.1.0-RC1, 2.6.32.41-cyangenmod pershoot, and using the 26.06.2.27_M radio.
Since I couldn't get a full charge with it powered off, I'm thinking it might be a hardware issue or maybe the radio since so I might try 26.08.04.30 radio. Googling other forums, people were able to get a replacement phone from T-Mobile and some others said their motherboard needed to be replaced.
Any other ideas before I call T-Mobile?
Thanks!
Did you try clearing battery stats?
redpoint73 said:
Did you try clearing battery stats?
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Click to collapse
Yes, several times. Good call, though! By clearing the stats, I was able to get to the 81%.
Thanks!
Have you tried reflashing the rom? Maybe trying a different rom? Clear caches? I dunno I'm shooting for broke i guess....is it an aftermarket battery or stock?
killj0y said:
Have you tried reflashing the rom? Maybe trying a different rom? Clear caches? I dunno I'm shooting for broke i guess....is it an aftermarket battery or stock?
Click to expand...
Click to collapse
Thanks, killj0y. Yes. I did that after posting. I did a Titanium Backup, then Nandroid backup, then wipe, superwipe, then flashed the CM7 nightly, (which is very slick, i might add). After bump charging I was able to get it up to 71%. I let it go down to 0% overnight and now I'm letting it recharge fully.
In about an hour, I'm going to call T-mobile and see if they have any other ideas.
It is an aftermarket battery but it behaves just like the OEM/stock.
You shouldn't ever drain your battery to 0% on purpose. You run the risk of the battery not being able to take a charge. Draining to 20% for battery meter calibration purposes is more than sufficient.
Yea plus aftermarket batteries can and do fail more often than stock. What brands is it?
Do you still have your stock battery? Try using that one and see how it acts. I'm willing to bet it's the battery.
The OEM battery I could never get above 71% and the new battery I have it up to 94% now and it isn't charging any higher.
I've had it plugged in for two hours. I have read the warnings about letting the battery drop to 0% and I agree, but I figure one time wouldn't hurt it. I got the second battery, thinking it was a problem with the OEM battery.
Ah! This happened as I was typing this. For the first time in a long time, the LED is green but the battery is at 94%, which I think might be okay.
Maybe the wipe/superwipe/reflash helped? I will keep you all updated and I sincerely appreciate the help and advice.
jpabian said:
I have read the warnings about letting the battery drop to 0% and I agree, but I figure one time wouldn't hurt it.
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Click to collapse
If that one time results in a battery that won't take a charge, then it hurts. Full discharge is also not good for the long term life of Li ion batteries. And it certainly doesn't help anything to run the battery to empty.
Yea I don't know how many times I've corrected people still quoting NiCd rules for Lithium ion batteries phone or otherwise lol. Anyways if the stock does the same thing it is probably the phone. Especially after a wipe, was it a clean reflash of the rom? Maybe that would work.
Here's my update. Kind of interesting.
So, by evening, my phone got down to 4% left of the battery. I plugged it in, (with my factory charger), and ZDBox said it would be 2 hours, 44 minutes until fully charged. Three hours later, it was at 45% full. I rebooted the phone and when it came up, it said it was at 86% full. Then I left it plugged in over night.
This morning, it was still at 86% and I rebooted it again, and then when it came back up it was 93% and within a couple of minutes, the LED turned green.
So, with this new batter, it *seems* slightly better, but I don't understand what's going on. This is weird, if you ask me.
The other bit of info is that at 7AM it was 93% and right now, (9AM, two hours later), my phone is at 72% with the majority of it being consumed by "Cell Standby."
I guess, since this is a new battery, there still might be some calibration/conditioning going on. I am still unsure if this points to a hardware issue with the phone.
Thanks again, for the help guys! I really wonder if I am the only person who is experiencing something like this.
Update: 19.09
Things have been a little better, but still not perfect.
I flashed CM7 Nightly, pershoot kernel, and 4.30 radio.
I have only been plugging in the charger when the phone drops below 20%. The phone only charges to 45% - 51%, then I reboot, and when it comes back up, the battery will read anywhere from 88% - 93%.
Once unplugged the batter rapidly drops down to the low 80's - mid 70 percentile and it stays in that range for a much longer time. Then once the battery drops below 40% is drains rapidly.
So, for example it says right now, "7h 54m 58s on Battery" and I'm at 20%. The breakdown is as follows:
Android system: 57%
Cell Standby: 12%
Wi-Fi: 12%
Phone Idle: 11%
Voice Calls: 9%
I'm really frustrated with having to reboot the phone to get seemingly get a full charge.
I think I am going to flash the latest nightly and then reflash the pershoot kernel and see where we are at that point. I still haven't decided if I need to call T-mobile since it could be a hardware issue.
It really sounds like a hardware issue to me. especially after several so many flashes and batteries...
killj0y said:
It really sounds like a hardware issue to me. especially after several so many flashes and batteries...
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Click to collapse
Indeed. I called T-Mobile this morning and they are sending me a new phone. The guy asked me to inspect the battery, contacts, etc. He did ask me if I had put any "modified" software on it.
He also said, if they found modified software on it when they received it back at the shop, I would be charged a $108 restocking fee.
Quick, where's that downgrade guide!
Thanks for your help, everyone!
Update!
After I talked to T-Mobile, I downgraded my phone to the OTA Gingerbread and unrooted it, and turned S-ON. I admit, I was impressed with the OTA update since I had been running cooked roms since I got the think back in November 2010.
My new phone came today. Immediately, the battery behavior is completely different. I took out my battery from my old phone that said it was at 51% and put in the new phone and it said it was 80%. That's a good sign!
While we were at dinner, I got all the OTA updates, which really meant when I got home I had to downgrade it, but the guides here were really great, and I was back in business in no time.
I went with the latest CM7 nightly, the LEAK radio, and the latest pershoot kernel. I can tell already that battery behavior is much better.
Interestingly enough, on the stock gingerbread ROM, the DISPLAY was the major consumer of battery. Now on the stack I described, "Cell Phone Idle" is the biggest consumer. Maybe the stock T-MOUS radio is the best!?!? Who knows.
I hope this helps others who might be having weird battery problems. Have a great weekend!
I'm having this exact behavior where I can't get past ~73% without rebooting, then it goes to ~93%, which is about as high as I can get it. Guess I'll call T-Mo, I've seen it with different ROMs to I figured it was probably hardware as well.
Hey Thermalx, I hear you! The replacement phone I got from T-Mobile is behaves completely different. I have kept a charge +26 hours. I never thought I'd see the day!
Let us know how it works out.
Thanks!

[Q] Battery Calibration

Hey I've read on other forums about these battery calibration apps and whatnot, just want to know if anyone has used them and know if they really do work? The wife and I both have the Dinc2 and i loaded andybonestock on both of our phones.. i use my phone like crazy and she barely uses hers. i put drellis's 21 on and UV 50 and within 15 min off the charger i'm down at most to 98 battery and she's already down to 90. her battery drains rediculously faster than mine and they're both the same exact rom's and kernel specs. Will these app's actually work or is there a real/better way to get hers working better?
Use battery calibration from the market and follow the instructions to a T. Her battery could also be defective. Try the calibration first though.
that's what i'm trying to do. I have it charging right now, at 84% then im going to run it.. just wanted to know if there was any proof it worked or any other option
I left my inc2 get charge to 100% and then use the battery calibration,i notice that my battery goes down from 100% to 97% in just 5second,the battery life is good after goes to 97%,but im not sure why goes down to 97% that fast.
android-incredible said:
I left my inc2 get charge to 100% and then use the battery calibration,i notice that my battery goes down from 100% to 97% in just 5second,the battery life is good after goes to 97%,but im not sure why goes down to 97% that fast.
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Click to collapse
Just a heads up, that is normal, your battery will never stay at 100% it doesn't charge to 100% unless you bump charge it (and that is bad for your actual battery). Having it drop anywhere from 97% to 92% is common, after that you will notice a substantial slowdown in battery drain unless you are heavily using the phone.
I added a picture of my battery life as an example of the length I am getting from the ICS Rom I'm currently using. I have my phone oc'd to 1.4ghz and uv -25 across the board. This screenshot was taken after a day full of phone calls ranging between 3 minutes and 20 minutes, moderate browser usage, moderate facebook usage and lots of texting.
Ya I knew it wouldn't stay at 100 at all but like how mine would be at 97 after 15min and hers at 90.. it just didn't add up.. she rarely used her phone and only had about 6 hours of charge, while my battery with excessive use had enough battery to last me about 16 hours. I reset battery stats and then bump charged her phone. Now its fine
Sent from my Mikrunny'd Vivo_w
faehsemc said:
Ya I knew it wouldn't stay at 100 at all but like how mine would be at 97 after 15min and hers at 90.. it just didn't add up.. she rarely used her phone and only had about 6 hours of charge, while my battery with excessive use had enough battery to last me about 16 hours. I reset battery stats and then bump charged her phone. Now its fine
Sent from my Mikrunny'd Vivo_w
Click to expand...
Click to collapse
glad you figured it out.
careful on bump charging, it decreases the life of the battery itself everytime you do it.
I personally don't use the apps. I've had the best luck with charging to 100%, power off and charge till green light, unplug and do one more time, boot to recovery, wipe battery, power up and unplug. That's just me though.
Sent from my ADR6350 using xda premium
CondemnedSoul said:
I personally don't use the apps. I've had the best luck with charging to 100%, power off and charge till green light, unplug and do one more time, boot to recovery, wipe battery, power up and unplug. That's just me though.
Sent from my ADR6350 using xda premium
Click to expand...
Click to collapse
That's what I did to remove battery stats.. read up on the app and realized its the same thing as doing it in recovery
Sent from my Mikrunny'd Vivo_w
CondemnedSoul said:
I personally don't use the apps. I've had the best luck with charging to 100%, power off and charge till green light, unplug and do one more time, boot to recovery, wipe battery, power up and unplug. That's just me though.
Sent from my ADR6350 using xda premium
Click to expand...
Click to collapse
Charging to 100% and then powering off and charging again IS bump charging, that is bad for your battery itself, it takes away life on the actual battery everytime you do it. I said this above. You may be getting an extra half hour to an hour out of your batterys life but you are decreasing the amount of times it can actually hold a charge each time you do that, therefore ruining your battery for a tiny bit of extra battery life per charge.
dankblaze said:
Charging to 100% and then powering off and charging again IS bump charging, that is bad for your battery itself, it takes away life on the actual battery everytime you do it. I said this above. You may be getting an extra half hour to an hour out of your batterys life but you are decreasing the amount of times it can actually hold a charge each time you do that, therefore ruining your battery for a tiny bit of extra battery life per charge.
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Click to collapse
I'm quite aware of what it IS. I also didn't say I do it every charge. I also know that some say its not good. I also know some say smoking can kill you. I also know I've done it on other devices with no problems. And I also didn't say for anyone to do it. I only said what I do and what has worked for me.
Sent from my ADR6350 using xda premium
Face Palm!
Sent from my Mikrunny'd Vivo_w
CondemnedSoul said:
I'm quite aware of what it IS. I also didn't say I do it every charge. I also know that some say its not good. I also know some say smoking can kill you. I also know I've done it on other devices with no problems. And I also didn't say for anyone to do it. I only said what I do and what has worked for me.
Sent from my ADR6350 using xda premium
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Click to collapse
The smoking analogy doesn't really relate, smoking can kill you but doesn't always, bump charging for a fact decreased the longevity of your battery hence shortens the time before it does not hold a charge anymore and you have to buy a new one. I made a factual comment, I did not need a condesending response.
dankblaze said:
The smoking analogy doesn't really relate, smoking can kill you but doesn't always, bump charging for a fact decreased the longevity of your battery hence shortens the time before it does not hold a charge anymore and you have to buy a new one. I made a factual comment, I did not need a condesending response.
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Click to collapse
*condescending
And if it's a fact, can you provide a link to a scientific study backing up your claims? If not, please don't claim that it's fact based on forum posts by other users and your own anecdotal experiences.
Thanks!

Is charging the battery constantly bad?

Hey everyone.
Just wanted to know if charging the tablet almost constantly is a bad thing. I use the tablet a lot every day, so when I'm at 60%, for example, I charge it again while I'm at lunch or doing something else, so that I can keep using the tablet later with full charge available again. I never let my tablet go down to 5%.
Is this bad for the battery in the long run?
Thanks.
Generally, it's best to not allow full cycle recharging...i.e. not fully charge or discharge, it's better for small charge cycles, like 40%<->90%
Some links to help garner some understanding:
http://forum.xda-developers.com/showthread.php?t=2469261
Which provides these links:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
http://www.eetasia.com/STATIC/PDF/200806/EEOL_2008JUN16_POW_TA_01.pdf
http://macomp.ru/wp-content/uploads/2012/04/1607542.pdf
mdamaged said:
Generally, it's best to not allow full cycle recharging...i.e. not fully charge or discharge, it's better for small charge cycles, like 40%<->90%
Some links to help garner some understanding:
http://forum.xda-developers.com/showthread.php?t=2469261
Which provides these links:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
http://www.eetasia.com/STATIC/PDF/200806/EEOL_2008JUN16_POW_TA_01.pdf
http://macomp.ru/wp-content/uploads/2012/04/1607542.pdf
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Click to collapse
That's right. At least for what I know. It says the same on Apple's website about batteries. :good:
So then I guess I'm doing it right, correct?
I charge from 60% to 100% or from 50% to 100% again. Maybe I should do it only up to 90% then.
Sensamic said:
So then I guess I'm doing it right, correct?
I charge from 60% to 100% or from 50% to 100% again. Maybe I should do it only up to 90% then.
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Click to collapse
I only charge to 100% when I am going to be away from a charger for a long time, otherwise I stop at 90%-ish (my battery app announces when it is at 90% and there are kernels which will stop the charge at what you specify), as the links above state, charging to 100% all the time will shorten the lifetime of your battery, this may or may not matter to someone, for example, if you buy a new tablet every year, or you're well-off financially, then you're probably not too concerned with how many years your battery lasts, in which case charging to 100% a lot won't really matter much, since you'll likely own a newer tablet by time the battery does die.
In short, it's up to you and what you want to get out of your battery's lifetime.
I am using the good old 100% and then use until near 0%. I have found that this way the battery lasts longer.
As I am writing i have 43% battery with 5:40h screen time. I am using Greenify btw.
mulperi said:
I am using the good old 100% and then use until near 0%. I have found that this way the battery lasts longer.
As I am writing i have 43% battery with 5:40h screen time. I am using Greenify btw.
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Click to collapse
There are two kinds of battery life. These recommendations are for battery longevity. How long until the battery begins to lose the ability to fully charge.
The article at battery university explains how charging works, and the best way to charge batteries. What you are doing is the opposite of that way. If you think you are going to have your tablet longer than a year, it's worth taking the time to read the articles linked.
There is noting particularly wrong with full charges every time, but there are 'righter' ways to charge.
Sent from my Nexus 7 using XDA Premium 4 mobile app
Is there any kind of battery forming on new nexus7?
I mean i bought nexus 7 and straight from box i rooted,unlocked and installed custom kernel which forbids battery 2 fully charge over 92%...
Should i revert to stock and firstly fully charge my tablet then go to custom kernel or i am good at it right now ? Tnx
ps. (my nexus 7 was on 38% when i put it out of box)
aigaming said:
Is there any kind of battery forming on new nexus7?
I mean i bought nexus 7 and straight from box i rooted,unlocked and installed custom kernel which forbids battery 2 fully charge over 92%...
Should i revery to stock and firstly fully charge my tablet then go to custom kernel or i am good at it right now ? Tnx
ps. (my nexus 7 was on 38% when i put it out of box)
Click to expand...
Click to collapse
Based on what I've read, you'd gain no benefit by reverting to stock and charging to 100%, it MAY or may not effect the internal battery calibration, but it does not affect the lifetime or anything.
Also, these kernels usually have a way for you to change the % at which it stops, usually by cat'ing or changing some value that the kernel reads, you could just cat/echo/change 92% to 100%, and let it charge to 100%, then change it back. YMMV.
mdamaged said:
Based on what I've read, you'd gain no benefit by reverting to stock and charging to 100%, it MAY or may not effect the internal battery calibration, but it does not affect the lifetime or anything.
Also, these kernels usually have a way for you to change the % at which it stops, usually by cat'ing or changing some value that the kernel reads, you could just cat/echo/change 92% to 100%, and let it charge to 100%, then change it back. YMMV.
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Click to collapse
Tnx m8
The worst thing you can do to lithium-ion batteries is let them discharge completely.
Not letting the lithium-ion batteries discharge more than 10% will increase the cycles by thousands we're talking going from 350 cycles to 4000.
So, ideally, you want to charge your batteries (of this type) after a 10% discharge but we all know that's impossible so the best thing you can do is to charge your tablet everytime you can. Even if it has much battery left.
I knew that allready but i didn't know that it is not good to charge battery to 100 till i came to nexus 7 forums I always charged all my devices to 100% and never had a problem with battery
Sent from my LG-P990 using Tapatalk
aigaming said:
I knew that allready but i didn't know that it is not good to charge battery to 100 till i came to nexus 7 forums I always charged all my devices to 100% and never had a problem with battery
Sent from my LG-P990 using Tapatalk
Click to expand...
Click to collapse
You should charge to 100%, there is no problem with that.
On a perfect world you would want to charge everytime the battery hit 90%, this gives the best amount of charge cycles and life time.
However we all know that's not going to happen because the tablet is here to serve our needs and not the other way around so stick to charging it whenever you can.
Great Question!
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow
droidshadow said:
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
Click to expand...
Click to collapse
There has been speculation in the franco thread that undervolting could actually hurt battery charge life, due to the CPU having to work harder due to having less voltage, not sure if that has any merit or not.
The reasoning behind the not charging above 90%, and not allowing full-cycle charges is outlined much better in the links I posted than I could do here, also I would be just regurgitating information that is already there for the most part.
40% is just a number I pulled out of air, the best practice is to keep the charge delta as small as possible. So, let's say we charge the device to 90%, it is better to charge it when it hits 80% than it is to wait till it hits 70%, because a smaller charge delta has occurred, so charge often, but if you want the lifetime of your battery to be maximized (lifetime as in the way ezas explained it, i.e. "(...)battery longevity. How long until the battery begins to lose the ability to fully charge"), than try to not charge it to 100%.
Also, it has to be said, heat also affects the battery longevity, that is why I also recommend not charging while a device is in its case. And not leaving it sit on a Qi charger for too long, some cause more heat than others, but heat is a battery's enemy.
droidshadow said:
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow
Click to expand...
Click to collapse
It would no doubt void your warranty. As for battery replacements, I have not yet found one, I'm not saying there isn't one to be found, but I have yet to find it, I figure the reason is because they are not yet in demand since the tablet is relatively new and demands for replacement batteries would be too low, obviously and eventually this will change.
droidshadow said:
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow
Click to expand...
Click to collapse
What I said was that, theorically, in a perfect world, you want to charge your tablet when it starts losing charge and ideally never let it get below 90%. This is almost impossible because we use our tablet and we don't want to constantly be charging it so ideally you want to charge it whenever you can.

Redmi Note 8 Pro not charging at 100% after less than a month of use

Hi, I'm currently experiencing some problems with my Redmi Note 8 Pro.
I've had my phone for less than a month, and it's starting to get issues with the battery.
The battery, whether I charge it with the original wall charger, or I use a computer to charge it, or o use an alternative wall charger (that is for slow charge), it can't get to 100%.
It gets stuck at 99% and says, full charge in 2 minutes, even though the 2 minutes have passed long time ago.
I haven't done a full battery drain, and I always try to use a slow charge charger.
I also haven't done a full cycle without using the phone, maybe that's the problem.
But I'm worried, and I need some help, because I got the phone (as I said) less than a month ago, I haven't even payed the first installment.
I'm still within the seller's warranty, but I need some advices to what can I do, because returning the phone to the seller, to make a change, is gonna cost me 15 to 20 days. And I don't have any other phone to use.
Please, if someone can give me some advice, or tell me what to do, it's completely welcome.
Thanks.
And by the way, I'm using the Global 128Gb version, if that helps.
Edit 29/01/2020: I did a full discharge, because I couldn't read the quotes earlier, and I didn't realize how big the problem could be. Now, the phone can't go over 79%.
I didn't expected this issue with my RN8P, but with other phones (cheap noname ones).
A discharge to around 5%, and a full charge without unplugging did the trick for me.
AnonyIsRight said:
Hi, I'm currently experiencing some problems with my Redmi Note 8 Pro.
I've had my month for less than a month, and it's starting to get issues with the battery.
The battery, whether I charge it with the original wall charger, or I use a computer to charge it, or o use an alternative wall charger (that is for slow charge), it can't get to 100%.
It gets stuck at 99% and says, full charge in 2 minutes, even though the 2 minutes have passed long time ago.
I haven't done a full battery drain, and I always try to use a slow charge charger.
I also haven't done a full cycle without using the phone, maybe that's the problem.
But I'm worried, and I need some help, because I got the phone (as I said) less than a month ago, I haven't even payed the first installment.
I'm still within the seller's warranty, but I need some advices to what can I do, because returning the phone to the seller, to make a change, is gonna cost me 15 to 20 days. And I don't have any other phone to use.
Please, if someone can give me some advice, or tell me what to do, it's completely welcome.
Thanks.
And by the way, I'm using the Global 128Gb version, if that helps.
Click to expand...
Click to collapse
When I cannot tell if its some HW related problem with your phone or battery but I am really wondering why you want to do full charges (and/or discharges)? It is known to wear battery way faster. Li-on or Li-po batteries do not have memory effects and it is known to be best to always keep them charge for example between 15-20% and 80-85% trying to never get bellow or above.
This phone has a pretty big battery, that normally should be enough to bring you through a day of normal use (if it does not you may want to check your hungry apps running in the bg) but maybe you are an heavy gamer or use your phone for some heavy usage stuff?
Even then, it would be best to do 2 quick 15 to 50-60% in about 30 mins with QC2 (18W original Wall charger) rather than one unique full charge.
Looking at what you said with slow charging you probably know all of that already, but the faster you charge the battery, even if same %, the faster it will discharge. As odd as it is, remains factual.
I dont know if you ever used an external amperemeter or similar to check what kind of current was actually going through your battery while charging, but if you do you will notice the first % goes way faster to charge than the last few %. The chip dealing with the battery charge, charges slower and slower toward the end because it could damage the battery, when on the opposite it is rather safe to quick charge the % in the middle.
Also you may want to check your alternative 'slow wall charger' to make sure it provides you with a steady voltage current (V). If it is fluctuating too much, it may damage your battery.
If you want to do further research about the subject, there is a note on the RN8PRO Telegram group explaining how to calibrate your battery by deleting some system files (root needed as far as I remember) and having some charges/discharges steps. Personally I have not done it because it requires to go to 100% and 0% a few times, and depleting a Li-ion/Li-po battery completely can damage it irreversibly. They are not meant to be discharged fully period. Now battery should not be completely drained when OS takes the phone off, that said we never know for sure since we cannot change that setting unlike on our windows laptops, but I dont want to take the risk.
When you are stuck to 99% it kind of looks to be the OS not being able to know if the battery is fully charged or not. In that state of things, have you tried to turn off the device without unplugging to see if the off-mode charging screen (the small battery screen with % when you turn your phone off) also remains at 99% or gets to 100% at some point? Because maybe all you need is to restart the phone to make OS aware the battery is fully charged. Could be a SW known/unknown issue/bug to be fixed with future updates for all I know.
But again, I don't think you should fully charge and/or discharge (if you do) your phone when you can avoid it.
Just my 2 cents.
Hope this helps,
Regards,
-=Fxs=- said:
I didn't expected this issue with my RN8P, but with other phones (cheap noname ones).
A discharge to around 5%, and a full charge without unplugging did the trick for me.
Click to expand...
Click to collapse
I tried it, and... it got worse.
Now it can't go over 79%. :c
Thanks for trying to help anyways.
Muad.Dib said:
When I cannot tell if its some HW related problem with your phone or battery but I am really wondering why you want to do full charges (and/or discharges)? It is known to wear battery way faster. Li-on or Li-po batteries do not have memory effects and it is known to be best to always keep them charge for example between 15-20% and 80-85% trying to never get bellow or above.
This phone has a pretty big battery, that normally should be enough to bring you through a day of normal use (if it does not you may want to check your hungry apps running in the bg) but maybe you are an heavy gamer or use your phone for some heavy usage stuff?
Even then, it would be best to do 2 quick 15 to 50-60% in about 30 mins with QC2 (18W original Wall charger) rather than one unique full charge.
Looking at what you said with slow charging you probably know all of that already, but the faster you charge the battery, even if same %, the faster it will discharge. As odd as it is, remains factual.
I dont know if you ever used an external amperemeter or similar to check what kind of current was actually going through your battery while charging, but if you do you will notice the first % goes way faster to charge than the last few %. The chip dealing with the battery charge, charges slower and slower toward the end because it could damage the battery, when on the opposite it is rather safe to quick charge the % in the middle.
Also you may want to check your alternative 'slow wall charger' to make sure it provides you with a steady voltage current (V). If it is fluctuating too much, it may damage your battery.
If you want to do further research about the subject, there is a note on the RN8PRO Telegram group explaining how to calibrate your battery by deleting some system files (root needed as far as I remember) and having some charges/discharges steps. Personally I have not done it because it requires to go to 100% and 0% a few times, and depleting a Li-ion/Li-po battery completely can damage it irreversibly. They are not meant to be discharged fully period. Now battery should not be completely drained when OS takes the phone off, that said we never know for sure since we cannot change that setting unlike on our windows laptops, but I dont want to take the risk.
When you are stuck to 99% it kind of looks to be the OS not being able to know if the battery is fully charged or not. In that state of things, have you tried to turn off the device without unplugging to see if the off-mode charging screen (the small battery screen with % when you turn your phone off) also remains at 99% or gets to 100% at some point? Because maybe all you need is to restart the phone to make OS aware the battery is fully charged. Could be a SW known/unknown issue/bug to be fixed with future updates for all I know.
But again, I don't think you should fully charge and/or discharge (if you do) your phone when you can avoid it.
Just my 2 cents.
Hope this helps,
Regards,
Click to expand...
Click to collapse
Hi Muad.Dib,
Well, I wanted to do that full charge a/o discharge because I thought it would help with the issue (turns out, it didn't, it got worse as you said) but I didn't know the effects of this before, I always thought it wouldn't have any effect. I wish I could have read your reply before doing it (I was busy and couldn't read it).
The battery lasts for more than a day (or it did before), and I always try to keep it clean from battery draining apps, and I don't play games that much on the phone, less than an hour per day.
Do you recommend me to do those 2 charges to 60% in my state? (phone can't get over 79% now).
I haven't ever used an amperemeter because I don't have one, and neither I do know how to use one of those.
If you can lend me a hand and give me the link to join the Telegram Group, it would very helpful ??. But I don't want to root the phone yet, cause the seller's warranty stills intact.
And yes, I have tried it and the off-mode charging screen keeps showing me 99% (or kept, because now it keeps at 79%). And I also tried few restarts and it didn't fixed it. :c
And I'm sorry, I wish I could've avoided it, but I read your reply too late.
Thanks for trying to help me anyways.
PS. I will try to do a factory reset to see if the MIUI update has something to do with the issue (because the seller told me to do it, and I will do it, though I don't think it could solve the issue). Please, if you have any advice before I do it, you could help me a lot. ( I'll do it something around 11:00 AM in GMT -03:00)
AnonyIsRight said:
Hi Muad.Dib,
Well, I wanted to do that full charge a/o discharge because I thought it would help with the issue (turns out, it didn't, it got worse as you said) but I didn't know the effects of this before, I always thought it wouldn't have any effect. I wish I could have read your reply before doing it (I was busy and couldn't read it).
The battery lasts for more than a day (or it did before), and I always try to keep it clean from battery draining apps, and I don't play games that much on the phone, less than an hour per day.
Do you recommend me to do those 2 charges to 60% in my state? (phone can't get over 79% now).
Click to expand...
Click to collapse
Hey.
Very strange what is happening to you it's probably the first time I read about something like this.
Please note I am no battery expert either.
From own experience and friends, usually when you wear a battery (or it worn by itself after use or bad storage condition before being sold) it still goes up to 100% but does not retain original design capacity anymore. The usual behavior is like for example you still have like 30% left, and suddenly it drops to like 5% and you only have a few seconds to plug it in the charger.
When that's happens it is time to change battery.
In your case I really have no idea what could prevent HW/SW to reach 100%.
AnonyIsRight said:
I haven't ever used an amperemeter because I don't have one, and neither I do know how to use one of those.
Click to expand...
Click to collapse
Oh those are easy to use as I meant some kind of small USB device that you plug in between your charger and your phone. They are cheap and you get them for like 10 bucks on Amazon. Readings might not be 100% accurate but they still give a decent idea as they display Voltage, Amperage and accumulated capacity/used current for device plugged.
AnonyIsRight said:
If you can lend me a hand and give me the link to join the Telegram Group, it would very helpful . But I don't want to root the phone yet, cause the seller's warranty stills intact.
Click to expand...
Click to collapse
As I said I am nothing like an expert or anything so I am unsure what I can do to help. However I did check the telegram group and I confirm you the battery calibration thing is a rooted thing.
To find that group it is pretty easy just search for Redmi Note 8 Pro OFFICIAL from telegram and join the group.
You find quite a few things there.
AnonyIsRight said:
And yes, I have tried it and the off-mode charging screen keeps showing me 99% (or kept, because now it keeps at 79%). And I also tried few restarts and it didn't fixed it. :c
Click to expand...
Click to collapse
Normally nothing you could have done, could have damaged the battery this way. Depleting it completely could have shorten its life or damage its overall capacity, but by all means there is no way in just a month you could have damaged the battery to this point. So either the OS is not reading things right (what version of OS and phone do you have - which region is your rom?) or either sensors or battery have a problem.
Since you still are under warranty period I would definitely get it replaced. Maybe you got a faulty batch or something. This happens.
AnonyIsRight said:
PS. I will try to do a factory reset to see if the MIUI update has something to do with the issue (because the seller told me to do it, and I will do it, though I don't think it could solve the issue). Please, if you have any advice before I do it, you could help me a lot. ( I'll do it something around 11:00 AM in GMT -03:00)
Click to expand...
Click to collapse
This definitely cannot hurt to try.
If that does not work return the phone.
Just to know, based on your flag I would assume you are in Chile but I may be wrong. If I am not mistaking it is summer there and probably is pretty hot. I wonder if 'too hot' could damage the battery.
Hope this helps.
Regards,

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