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Anker battery 'ageing'. What does it mean?

I am using the Anker 1900mAh battery for last 3 weeks and I am satisfied with the battery life it provides. I did 4-5 charge-discharge cycles and now I regularly get 24hrs - 27hrs life out of it. Today I noticed that BMW Pro is showing battery '14% aging'! What does this mean? Is my battery dying? To confirm I installed the HTC battery widget and it shows nothing abnormal. Please check the screenshots. Is something wrong with my battery?

More than 100 views. Nobody?

My aging says 0%, on stock battery... 5 month old.

I gave up using BMW after getting my sensation, the battery driver by HTC is useless and the statistics the driver gives to BMW can't be trusted.
If you're that concerned then charge to 100%, delete your your battery stats and history and hence start again - but I don't think anything has changed for you, it still guesses your battery as around 1900.

boomboomer said:
I gave up using BMW after getting my sensation, the battery driver by HTC is useless and the statistics the driver gives to BMW can't be trusted.
If you're that concerned then charge to 100%, delete your your battery stats and history and hence start again - but I don't think anything has changed for you, it still guesses your battery as around 1900.
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Click to collapse
Absolutly right about BMW and Sensation. BMW Useless and confusing only. Don't worry about ageing - continue to use as before.

My phone is not rooted. So I cant delete battery stats. And I get excellent battery life. But the 'aging' thing was worrying me. But after reading your comments not so much worried now. What does 'aging' mean anyway? i.e. in the context of the battery.

Over time and use batteries age... They lose their capacity.... Aging 10% Means that the battery has 10% less capacity than it had when it was new....
Sent from my HTC Sensation

zcdg said:
Absolutly right about BMW and Sensation. BMW Useless and confusing only. Don't worry about ageing - continue to use as before.
Click to expand...
Click to collapse
There's nothing wrong with the app, it worked perfectly on my HD2, it's just the battery driver that's the issue for the sensation.

boomboomer said:
There's nothing wrong with the app, it worked perfectly on my HD2, it's just the battery driver that's the issue for the sensation.
Click to expand...
Click to collapse
I know that is Senasation's driver reporting not correct discharge current, only correct charge current. I meant BMW is useless with Sensation.
And i guess it is not problem of HTC's driver but hardware chipset used in sensation and evo 3d - driver can't read proper values from measurment circuit of chipset. If i would be driver itself, HTC could fix it easely.
---------- Post added at 08:49 AM ---------- Previous post was at 08:38 AM ----------
Don't expect from Anker same quantity of charge-discharge cycles as original battery. It may not work as long as original one(cycles i mean). Nothing can be done with it and nothing can help. They are cheap, so just buy new one when capacity will badly decrease.

Now BMW is showing aging to be 0%. How and why it showed 14% previously I dont know! The battery is hardly 3 weeks old. It cant begin to age so soon, can it? Maybe the earlier value was some wrong reporting. There seems to be a definite problem with the phone's battery driver.

As countless people told you by now - those stats don't mean ****. Stop relying on them. It's useless, confusing information with absolutely no value.
Your battery is fine.

anazei said:
As countless people told you by now - those stats don't mean ****. Stop relying on them. It's useless, confusing information with absolutely no value.
Your battery is fine.
Click to expand...
Click to collapse
^ What he said. If the developer set the app to say it's 99% aged while your battery still lasted about 25 hours or so.. would you believe that? I'm banking on the assumption that you're not a complete moron and WOULDNT believe that. This is almost the same thing, accrding to all the other users, the app and the battery drivers don't work well together. As everyone else has stated, stop using it? There really is only one way to test your battery properly, and that is to use it. If one day you only got like 15 hours out of your normal 27.. then you know there's a problem. screw the bmw app

anazei said:
As countless people told you by now - those stats don't mean ****. Stop relying on them. It's useless, confusing information with absolutely no value.
Your battery is fine.
Click to expand...
Click to collapse
I have understood it totally.
KAwAtA said:
^ What he said. If the developer set the app to say it's 99% aged while your battery still lasted about 25 hours or so.. would you believe that? I'm banking on the assumption that you're not a complete moron and WOULDNT believe that. This is almost the same thing, accrding to all the other users, the app and the battery drivers don't work well together. As everyone else has stated, stop using it? There really is only one way to test your battery properly, and that is to use it. If one day you only got like 15 hours out of your normal 27.. then you know there's a problem. screw the bmw app
Click to expand...
Click to collapse
Is there really any need for being this rude? I thought we were just having a discussion. Why are you getting exasperated?

sarkar_007 said:
Now BMW is showing aging to be 0%. How and why it showed 14% previously I dont know! The battery is hardly 3 weeks old. It cant begin to age so soon, can it? Maybe the earlier value was some wrong reporting. There seems to be a definite problem with the phone's battery driver.
Click to expand...
Click to collapse
Ignore, ignore, ignore. Just ignore. How can you trust it if BMW doesn't even report mA correctly (not it's fault). So stop worrying and just enjoy your phone.

tinky1 said:
Ignore, ignore, ignore. Just ignore. How can you trust it if BMW doesn't even report mA correctly (not it's fault). So stop worrying and just enjoy your phone.
Click to expand...
Click to collapse
Thats what I am going to do!

You may see what are aged battery here :http://78michel.unblog.fr/htc-desire-battery-shutdown-analysis/ and here :http://78michel.unblog.fr/?p=164
The SoC curve ( state of charge) shows a step during the charging cycle before reaching 100% and a shutdown while discharging. This is very typical.
The aging is in fact the amplitude of the step.....
A precise battery analysis requires a full charging cycle from 0% to 100% with a AC charger.
Your battery is clearly not aged at all..... don't worry

sarkar_007 said:
I have understood it totally.
Is there really any need for being this rude? I thought we were just having a discussion. Why are you getting exasperated?
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Click to collapse
How am I being rude? You should change the tone of how you read it. I didn't call you the moron, I was assuming you weren't and trying to give some kind of crappy analogy to make sense of it lol

Folks, wiping battery stats is to no use. It only contains the data of what have used the battery since last charge. When you unplug your phone from the charger, the stats are reset. You can't extend or damage the battery life by deleting/altering the battery stats file.

[Q] Battery level has gone crazy

Hey all,
recently I have encountered a rather big and annoying problem on my phone. It has to do with my battery. I've looked it up on xda, but nothing was really exactly like my problem.
The problem is that my battery level has gone absolutely crazy.
First, charging my phone takes many many hours. After around 5 hours it still wasn't fully charged.
Then when rebooting the phone, it magically said 100%. However, after this the phone drained extremely fast. Think around 20 percent per hour, while using it normally!
Secondly, around 40 percent the phone automatically turned off, without the usual HTC logo. When I turn it on again the battery level is suddenly 2 %. After a few times turning off and on the battery level goes up to 30 percent. This can be seen very well on the pictures.
The phone is 1,5 years old and I haven't installed a custom ROM.
Am I dealing with a broken battery or is the problem in the software?

Hi,
I'm not an expert, but I think your battery is exhausted.
But before you run buying another battery...
What charger are you using? Stock HTC or custom? If custom, what are the Voltage/Current output values?

probably your battery is dying as the above user said
or the battery it doesn't connect properly
check it
Kalashnikov94 said:
Then when rebooting the phone, it magically said 100%.
Click to expand...
Click to collapse
about this it is a htc's common issue

try this https://dl.dropbox.com/u/47039397/MODs/Battery Auto-calibration Script.zip

TheWall-[ITA] said:
Hi,
I'm not an expert, but I think your battery is exhausted.
But before you run buying another battery...
What charger are you using? Stock HTC or custom? If custom, what are the Voltage/Current output values?
Click to expand...
Click to collapse
It's HTC stock.
rzr86 said:
probably your battery is dying as the above user said
or the battery it doesn't connect properly
check it
Click to expand...
Click to collapse
Okay, thanks a lot! I was planning anyway to buy an Anker battery.

Kalashnikov94 said:
Okay, thanks a lot! I was planning anyway to buy an Anker battery.
Click to expand...
Click to collapse
Nice
Sorry for off topic: do you think it's better Anker or Mugen battery?

I had a similar problem. and my phone turns itself off.
i send phone to repair and he change display, battery and headphone

TheWall-[ITA] said:
Nice
Sorry for off topic: do you think it's better Anker or Mugen battery?
Click to expand...
Click to collapse
While reading on some forums about a better battery for the Sensation I haven't encountered Mugen, only Anker, which has some good reviews.

Phone won't turn on after overnight charge.

I found that my phone wouldn't turn on at all after charging it overnight, which I do every day. Might I have to get a battery replacement? If yes, two questions: where and how much? Or what are some things I can try out. I have also recently flashed a CM 10.1 ROM and have gotten battery problems with it like overheating and drainage.
*update*
Most likely not a battery problem since my computer was able to detect it. I also plugged in my MHL cable and nothing happened

You're not the first person with this issue. It's in a bricked state. I'd leave it unplugged for a while and then try plugging it in overnight again and see if you can power it up.
Sent from my HTC One X using xda app-developers app

exad said:
You're not the first person with this issue. It's in a bricked state. I'd leave it unplugged for a while and then try plugging it in overnight again and see if you can power it up.
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
I saw a similar post but the person's phone had a red light and also tried a search but couldn't find another thread with the same problem. And thanks for the suggestion man! Is there an alternative way so I can deplete the battery? I can't tell if the phone is on or off since my computer doesn't recognize it anymore. Would it be safe to cover it with a towel so the heat can do its work on the battery?

Are you sure it's the battery and not the screen?
Sent from my HTC One XL using xda premium

jun10rocks said:
I saw a similar post but the person's phone had a red light and also tried a search but couldn't find another thread with the same problem.
Click to expand...
Click to collapse
The red light might not come on at first, but might after charging for a few hours. Just let it charge (wall charger, not from a computer USB) and leave it be for a while.
jun10rocks said:
Would it be safe to cover it with a towel so the heat can do its work on the battery?
Click to expand...
Click to collapse
Charging efficiency for Li ion batteries is 97-99% regardless of temperature, as long as its above freezing (which I assume is not your situation). While higher temperatures may reduce internal resistance slightly (and therefore a minor improvement in charging time), I'd say its not worth the risk of covering the device, as thermal runaway can cause overheating, and even a fire or explosion. Anything near room temperature is fine for charging, and heat is generally the enemy of electronic devices.

timmaaa said:
Are you sure it's the battery and not the screen?
Sent from my HTC One XL using xda premium
Click to expand...
Click to collapse
I updated the OP yesterday stating that it may not be the battery.

redpoint73 said:
The red light might not come on at first, but might after charging for a few hours. Just let it charge (wall charger, not from a computer USB) and leave it be for a while.
Charging efficiency for Li ion batteries is 97-99% regardless of temperature, as long as its above freezing (which I assume is not your situation). While higher temperatures may reduce internal resistance slightly (and therefore a minor improvement in charging time), I'd say its not worth the risk of covering the device, as thermal runaway can cause overheating, and even a fire or explosion. Anything near room temperature is fine for charging, and heat is generally the enemy of electronic devices.
Click to expand...
Click to collapse
Ok thanks for heads up about a future explosion that could've happened. I have left the phone charging and still haven't gotten any sign of something working. I'm not sure what's the exact problem so I can't really look more into it.

*Problem kind of solved*
I got my phone replaced in an At&t store, good thing is that they didn't ask me if I had warranty (which I never get) or if the phone was unlocked

jun10rocks said:
*Problem kind of solved*
I got my phone replaced in an At&t store, good thing is that they didn't ask me if I had warranty (which I never get) or if the phone was unlocked
Click to expand...
Click to collapse
All HTC devices come with a 1-year warranty standard. AT&T doesn't offer extended warranties, only insurance (which I never get either).
If you tried charging the phone overnight, and short of various button combos (I've seen one guy on here, that for some odd reason, the phone only turned on when he did the hboot combo while the phone was plugged to the charger) there is not much you could have done, and it was likely a hardware issue. Which is a justified warranty replacement.
AT&T doesn't care if the bootloader is unlocked, rooted, custom ROM, etc.

redpoint73 said:
All HTC devices come with a 1-year warranty standard. AT&T doesn't offer extended warranties, only insurance (which I never get either).
If you tried charging the phone overnight, and short of various button combos (I've seen one guy on here, that for some odd reason, the phone only turned on when he did the hboot combo while the phone was plugged to the charger) there is not much you could have done, and it was likely a hardware issue. Which is a justified warranty replacement.
AT&T doesn't care if the bootloader is unlocked, rooted, custom ROM, etc.
Click to expand...
Click to collapse
Thanks for the info! Yes, I have tried every combo that I've looked up. I'm just glad to have back the opportunity to keep on trying out new ROMs and providing feedback when possible.

[Q] Differences between a BG58100 & GI39100 Battery? [ANSWERED]

Short but powerful,
Without all the blablabla straight to the point. I got ?fooled? by a phone company 's expert(?) who told me this was not going to do any damage to my phone, and refused me to give me my money back after i found out that the battery was not good(the same as OEM z710e voltage ratings) when i came home.
I have a z710e, it came out of the factory in 2011. Original battery specifications:
m/n BG58100 p/n 35H00150-02M (3.7VDC 5.62Whr 1520mah)
The battery triple checked by "Expert" and sold by him is a:
m/n BI39100 p/n 35H00170-01M (3.8VDC 6.08Whr 1600mah)
My phone model: z710e (PG58130) original battery p/n: 35H00150-02M from 2011.
Next time I'll check this stuff myself and don't let those people do it for me. They either don't have any good batteries for this model and just sell the one that actually over volts your phone. Or other batteries and so had in his mind to sell me this and don't care about it, like "oh well who the heck cares, this person will never find out and will return to me when his phones is death". Well I'm pretty sure that this will not make my phone last any longer than a year / half a year or less! And i still need it for a year or longer if possible.
Feel free to reply, but only if you know that what you are telling is 100% correct. Please avoid non-valid information or answers, thanks :good:
I am not a pro either but this just doesn't seem to be correct. Feel free to correct me, if i made any mistakes.
https://www.google.co.uk/?#q=35H00170-01M+compatibility
If you don't understand my actual question, then I'm deeply sorry. Often my stories are not so easy to understand duo to my bad English.
The question in a nutshell is simply : Will this higher end battery do damage to the phone and is my story right, i mean is this battery not compatible with my model because it can do damage duo to over volting the ma inboard/soc (because of higher battery output ratings?)

NiTrOwow said:
Short but powerful,
Without all the blablabla straight to the point. I got ?scammed? by a phone company 's expert(?) who told me this was not going to do any damage to my phone, and refused me to give me my money back after i found out that the battery was not good(the same as OEM z710e voltage ratings) when i came home.
I have a z710e, it came out of the factory in 2011. Original battery specifications:
m/n BG58100 p/n 35H00150-02M (3.7VDC 5.62Whr 1520mah)
The battery triple checked by "Expert" and sold by him is a:
m/n BI39100 p/n 35H00170-01M (3.8VDC 6.08Whr 1600mah)
My phone model: z710e (PG58130) original battery p/n: 35H00150-02M from 2011.
Next time I'll check this **** myself and don't let those people do it for me. They either don't have any good batteries for this model and just sell the one that actually over volts your phone. Or other batteries and so had in his mind to sell me this and don't care about it, like "oh well who the **** cares, this person will never find out and will return to me when his phones is death". Well I'm pretty sure that this will not make my phone last any longer than a year / half a year or less! And i still need it for a year or longer if possible.
Feel free to reply, but only if you know that what you are telling is 100% correct. Please avoid non-valid information or answers, thanks :good:
I am not a pro either but this just doesn't seem to be correct. Feel free to correct me, if i made any mistakes.
https://www.google.co.uk/?#q=35H00170-01M+compatibility
If you don't understand my actual question, then I'm deeply sorry. Often my stories are not so easy to understand duo to my bad English.
The question in a nutshell is simply : Will this higher end battery do damage to the phone and is my story right, i mean is this battery not compatible with my model because it can do damage duo to over volting the ma inboard/soc (because of higher battery output ratings?)
Click to expand...
Click to collapse
First of all you should search a little bit more to see that the same battery (35H00170-01M) is offered by numerous companies as a replacement battery for various phone models (Titan, Vivid, z710e...) just like the battery from your phone (35H00150-02M) is offered for the same models.
Then, you can find the same battery (35H00170-01M) offered with different voltages, both 3.7V and 3.8V, and the difference of 0.1V will not harm your phone, cause, you can see it yourself, voltage rating for the original phone charger is 5V and it doesn't harm your phone.
And the last, the other data you got for the battery (Whr and mah) mean only that you have battery that should last longer than the original one you have.
I hope I helped...

nlooooo said:
First of all you should search a little bit more to see that the same battery (35H00170-01M) is offered by numerous companies as a replacement battery for various phone models (Titan, Vivid, z710e...) just like the battery from your phone (35H00150-02M) is offered for the same models.
Then, you can find the same battery (35H00170-01M) offered with different voltages, both 3.7V and 3.8V, and the difference of 0.1V will not harm your phone, cause, you can see it yourself, voltage rating for the original phone charger is 5V and it doesn't harm your phone.
And the last, the other data you got for the battery (Whr and mah) mean only that you have battery that should last longer than the original one you have.
I hope I helped...
Click to expand...
Click to collapse
It indeed is, but i have really bad experience with replacement batteries. And those small 'voltage increases'. They end up to die quicker a lot quicker in my personal experience. And i think it is also the reason why, many sellers don't include my model in the compatibility list.The 3.8VDC 6.08whr version is meant for the XL and titan version witch is actually indeed the same but +300mhz overclocked.

NiTrOwow said:
It indeed is, but i have really bad experience with replacement batteries. And those small 'voltage increases'. They end up to die quicker a lot quicker in my personal experience. And i think it is also the reason why, many sellers don't include my model in the compatibility list.The 3.8VDC 6.08whr version is meant for the XL and titan version witch is actually indeed the same but +300mhz overclocked.
Click to expand...
Click to collapse
To be honest I have some cheap s**t called Hinorx Extended Battery that's 1200mah (don't know what's extended there but that's what I got when I ordered regular replacement battery for Sensation) and it works really well, can go up to 25-30h with 2h of screen, lots of wifi (ARHD 7.3 with 1,5MHz o/c).
Don't worry about 0.1V, it means nothing. And for life of battery I hope you got warranty...

nlooooo said:
To be honest I have some cheap s**t called Hinorx Extended Battery that's 1200mah (don't know what's extended there but that's what I got when I ordered regular replacement battery for Sensation) and it works really well, can go up to 25-30h with 2h of screen, lots of wifi (ARHD 7.3 with 1,5MHz o/c).
Don't worry about 0.1V, it means nothing. And for life of battery I hope you got warranty...
Click to expand...
Click to collapse
It don't has warranty. But it's oke. It is a OEM battery they said. Btw it works fine, only had to use another charger with a output of 1.5a. It would not charge otherwise. But well, lets see how long it keeps working.

Haha it seems to not work charging for 5 hours now and still 0% cannot go in cwm recovery and when it starts it will reboot and orange/green led will blink again. I tried to reboot it several times, tried to clean/bend the pins and all the other tips from XDA forum seasrch results and nothing seems to work.. Great =(

NiTrOwow said:
Haha it seems to not work charging for 5 hours now and still 0% cannot go in cwm recovery and when it starts it will reboot and orange/green led will blink again. I tried to reboot it several times, tried to clean/bend the pins and all the other tips from XDA forum seasrch results and nothing seems to work.. Great =(
Click to expand...
Click to collapse
Did you try defferent chargers, stock one should (1A) be fine.

nlooooo said:
Did you try defferent chargers, stock one should (1A) be fine.
Click to expand...
Click to collapse
Yes i did but it got extremly hot so i switched back to the stock charger. And it actually should be fine? +0.1 volt doesn't matter?
The battery does not hold charge at all. It turns on battery level is 0% and will reboot and do orange/green led indication for as long as you keep it in the charger. When you get it out of the charger and turn it on it will go off as soon as android is loaded up intro the pincode screen. Guy at the store told me the led indication meant that the bettery is at an extremly low level of power and that it just needs to charge some more.
Well i have been charging it for like +5 hours now for sure. Using the OEM charger rated at 5VDC 1A. It is not the cable or faulty charger. If i test the output or on my tablet it works just fine. And with the old battery i'm able to charge it, but the old battery is dead, it does not hold load properly anymore. It drops a lot of times from 80% to 1% in like maybe 30 minutes of usage.
Also when using the GI39100 i cannot get intro adb or recovery..

NiTrOwow said:
Yes i did but it got extremly hot so i switched back to the stock charger. And it actually should be fine? +0.1 volt doesn't matter?
The battery does not hold charge at all. It turns on battery level is 0% and will reboot and do orange/green led indication for as long as you keep it in the charger. When you get it out of the charger and turn it on it will go off as soon as android is loaded up intro the pincode screen. Guy at the store told me the led indication meant that the bettery is at an extremly low level of power and that it just needs to charge some more.
Well i have been charging it for like +5 hours now for sure. Using the OEM charger rated at 5VDC 1A. It is not the cable or faulty charger. If i test the output or on my tablet it works just fine. And with the old battery i'm able to charge it, but the old battery is dead, it does not hold load properly anymore. It drops a lot of times from 80% to 1% in like maybe 30 minutes of usage.
Also when using the GI39100 i cannot get intro adb or recovery..
Click to expand...
Click to collapse
Faulty battery. It's not about volts, it's about bad battery.
You should require replacement or reimbursement.

nlooooo said:
Faulty battery. It's not about volts, it's about bad battery.
You should require replacement or reimbursement.
Click to expand...
Click to collapse
It is the second brand new battery the guy in the store put intro it.
Both did the same, it just doens't work.
1. Does not turn on (sometimes when lucky)
2. Holds no charge
I did
1. Wipe battery stats (in the end, like 5 minutes ago from writting. It took me half an hour to get the phone booting while charging)
2. The phone started only twice, now it does nothing anymore (with this new bat).
Also the battery info was all wrong.
When i checked the 1st time when i got it on i went to settings > about the phone > status > batterystatus it did show me(i left it nearly 3 hours like this and still 0%):
- Batterystatus: Unknown <----------------- Before battery stat wipe, after wipe still the same, no power on.
- Battery level: 0% <----------------- Before battery stat wipe, after wipe still the same, no power on.
While it should look like this!
- Battery is being discharged (when not charging)
- Battery level: 93% (old poor battery meanwhile after so much testing already full again)
When i put the old battery in place it works without problems. When i put the new one in it doesn't + battery stats are not even readed by android itself and recovery menu stated a warning. "Warning phone is under-volted" or some message like that. And the LED indicator flash in an unusual way (orange/green) this probably is an error code. Well, complete nonsense because i use the same charger. And the XL version has the same 1A charger, so this makes no sense. The battery is just not compatible.
The battery has been charging for almost 13 hours now. And still 0% + orange/green led flashes.
I have no tools here i had to imprevise with crap, gluetape and a doorbell to get a cracky 5 dollar multimeter working, LoL.
here is the bat output;
a 0.08 v 20 3.52v hv 750 0.07 hv 200 06.8 with other words it should be fine to run and maybe get 50% battery level. But it is still z3r0~ when i put it in my phone.

Topic prefix can be set to [ANSWERED]. The m/n BI39100 p/n 35H00170-01M battery works just fine in the z710e. Confirmed to work, even with 0.1v increase (does not produce more heat or instability, like some cheap fake batteries do without protection IC xD)
I went back to the store they gave me another battery and it instantly worked. So i had two faulty batteries. Lucky me again haha....
Probably or the store where i got it from does not test bats and throws them intro one big box or just very very unlucky.
The battery stats now work, no warning in recovery menu and no orange/green flashing in the led indication.
So if somebody has the same issue as me, your battery is 100% sure faulty. And you should toss it back to the re-seller for warranty or if you purchased the parts loose RMA it.
Get or an good alternative non-oem brand like anker. That is sure to be safe and good of quality. And never use fake chargers from like cheap Chinese tabs or phones. Often they have terrible output and this can badly damage your battery/phone because the output might not be stable enough and drops and increases a lot of times, either using a 2A charger does not make any sense at all. It will go just as fast as a 1A charger because the limit is 1A through(in most phones some can have other ratings). Only thing that can damage your phone/battery is if you go over the 5VDC. More volts = more heat = less lifespan. Amps are taken by the device and volts are given.
Confused
The new battery i have now is a BI39100 35H00186-00M. The 35H00170-01M does not seem to work in a PG58130 z710e or i had two faulty batteries... ?

Couldn't find replacement battery and back cover

It seem like there is no way to buy a replacement battery for nexus 9 or the back cover. Is there any source for the purchasing？

http://bfy.tw/3RGR
http://www.etradesupply.com/htc/tablet/htc-google-nexus-9.html
https://www.ifixit.com/Store/Parts/HTC-Nexus-9

At both sites the replacement battery is out of stock. My battery has started acting very strange (tablet totally turns off around 20%, then when i plug it in battery is 100% dead, needs 15 minutes charging just to start up again).
I did quite a bit of googling but didn't find anything.

kingweee said:
At both sites the replacement battery is out of stock. My battery has started acting very strange (tablet totally turns off around 20%, then when i plug it in battery is 100% dead, needs 15 minutes charging just to start up again).
I did quite a bit of googling but didn't find anything.
Click to expand...
Click to collapse
Have you tried another charger? My charger acts weird.

whowatchlist said:
Have you tried another charger? My charger acts weird.
Click to expand...
Click to collapse
I have, it's not the charger. I'd simply like to buy a replacement battery but can't seem to find it for sale anywhere. Does anyone have any idea about where to buy one?

Bumping this thread. My aging Nexus 9 is in need of a new battery, but all the sites posted above show them as out of stock. Has anyone been able to purchase a replacement battery recently?

tibere86 said:
Bumping this thread. My aging Nexus 9 is in need of a new battery, but all the sites posted above show them as out of stock. Has anyone been able to purchase a replacement battery recently?
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If anybody is still searching (or has given up already): I just got a new battery from here: http://bigupgadgets.com/battery-35h00218-00m-b0p82100-for-htc-flounder.html. You may find it from other vendors if you search for "35H00218-00M".
The printing on the back looks different from my old battery - looks like this is indeed a new part, rather than a refurbished/replacement HTC battery. It fit perfectly, and charged fine. I just installed it yesterday, so I can't yet say how well it performs long term.

christian_l said:
If anybody is still searching (or has given up already): I just got a new battery from here: http://bigupgadgets.com/battery-35h00218-00m-b0p82100-for-htc-flounder.html. You may find it from other vendors if you search for "35H00218-00M".
The printing on the back looks different from my old battery - looks like this is indeed a new part, rather than a refurbished/replacement HTC battery. It fit perfectly, and charged fine. I just installed it yesterday, so I can't yet say how well it performs long term.
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Many thanks! I was able to order a replacement battery and replace mine. After about a week of use, I have not seen any issues. :good: Only complaint I would have is the slow shipping.

tibere86 said:
Many thanks! I was able to order a replacement battery and replace mine. After about a week of use, I have not seen any issues. :good: Only complaint I would have is the slow shipping.
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You're welcome! Yeah, I'm also quite happy with mine so far - it keeps the charge pretty well.

christian_l said:
If anybody is still searching (or has given up already): I just got a new battery from here: http://bigupgadgets.com/battery-35h00218-00m-b0p82100-for-htc-flounder.html. You may find it from other vendors if you search for "35H00218-00M".
The printing on the back looks different from my old battery - looks like this is indeed a new part, rather than a refurbished/replacement HTC battery. It fit perfectly, and charged fine. I just installed it yesterday, so I can't yet say how well it performs long term.
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So how did it turn out? My Nexus 9 is going to become sort of a lab rat for full-scale linux development on the device so I'm considering replacing the dying battery as well. I could get the aforementioned battery for around 30€. If the battery works without blowing up and is the advertised capacity, that is.

Alexandroid99 said:
So how did it turn out? My Nexus 9 is going to become sort of a lab rat for full-scale linux development on the device so I'm considering replacing the dying battery as well. I could get the aforementioned battery for around 30€. If the battery works without blowing up and is the advertised capacity, that is.
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It worked well, fewer slowdowns and crashes. That may be in part also because I fixed the location of the copper plate/heat sink that had been placed under the original battery (leading the heat into the device) to where it was supposed to be. Some problems that may be more related to the chip/RAM/64bit choice persisted (browser is still super slow with just a few tabs open). Not using it much these days except for ebooks, Hoopla, etc. When I don't use it for a while, I turn of the Wifi and the charge holds for many days. Good luck with your Linux endeavors.

christian_l said:
It worked well, fewer slowdowns and crashes. That may be in part also because I fixed the location of the copper plate/heat sink that had been placed under the original battery (leading the heat into the device) to where it was supposed to be. Some problems that may be more related to the chip/RAM/64bit choice persisted (browser is still super slow with just a few tabs open). Not using it much these days except for ebooks, Hoopla, etc. When I don't use it for a while, I turn of the Wifi and the charge holds for many days. Good luck with your Linux endeavors.
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Well all the other malfunctions are definitely NOT related to the battery, except if the old one maybe started to lack in persistent current delivery (which would cause the sudden shutoff - my Nextbit Robin had it as well and it would behave as if the battery wasn't designed to power the chipset, crashing at 70% charge). If something in the power delivery goes wonky then maybe that also messed up some memory addresses and CPU calculations.
But enough being a smartass - if the battery does hold up without life-threatening malfunctions then it might be a good option?

Well all the other malfunctions are definitely NOT related to the battery, except if the old one maybe started to lack in persistent current delivery (which would cause the sudden shutoff - my Nextbit Robin had it as well and it would behave as if the battery wasn't designed to power the chipset, crashing at 70% charge). If something in the power delivery goes wonky then maybe that also messed up some memory addresses and CPU calculations.
But enough being a smartass - if the battery does hold up without life-threatening malfunctions then it might be a good option?
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What I was trying to share is that the new battery (and its proper placement) fixed a couple of things for me that I hadn't expected to be related to the battery. So I got actually way more than just increased battery life. With some non-original batteries (e.g. for cameras) you see that the copies are definitely inferior to the original. This one was as good or better.
Of course that was two years ago - production standards may have changed, or you may get a battery that's been sitting around for the last two years (what would that do to a battery? - I have no idea). Mine's still working well after this time. I would definitely go for it, but I'd try to find a vendor where I can send it back if for some reason it's not working as advertised. I haven't heard of any of these batteries exploding, and really would not worry about it. Hope that helps.