Battery Won't Charge Past 95%

[Hans Sprungfeld]

Normal behavior on most devices.

[brainvision]

Not really normal behaviour IMO. all devices I had, all charges I did.

While it’s indeed a common issue if you search google, still i’s not “normal”.

SK search google and you’ll find most common solution, too 😉

[S K]

Thanks Brainvision, I tried google, can’t seem to find anything specific to iwork 10? can you point me in the right direction with a link or 2? happy to troubleshoot this myself, if I know where to begin. Battery seems to be functional and healthy, not sure why it won’t go past 95%.

[brainvision]

nope sorry, nothing specific to iWork 10, I forget to mention..

where do you noticed that, Android or Windows? Did you try to charge to the other OS to see if goes to 100%?

Generally speaking this issue is not related to battery health but it’s more of a bad battery stats; usually the situation should go back to normal without your intervention after a bunch (unknown number of) charges/discharges process; it could help to charge till your max percentual, reboot the device and let it charge again; you could also try to reboot to other OS and charge there to 100%..

Back in the time of Froyo someone used to suggest to remove the battery stats file, but it’s always useless; better to let the tablet discharge to 0% – it should not boot anymore and then let it overcharge (leave it attached for 2 hours when it says it finished). Do that 2 consecutive times, no more than 2 times btw!

These modern battery are really full charged (100%) for a minute or two, so it’s normal to have 99% but not 95 imo.. Again, nothing you should really care about, situation should go back to normal without your intervention, so it’s up to you if you are in a hurry 😀

[Martin Gorbush]

S K wrote:

(…) is there any reason why the battery on this tablet would not recharge past 95%?

Can you check what maximum battery voltage is there?

Do you charge it under Windows or Android? I ask because there is different maximum voltage for battery (4.2V vs 4.35V).

[S K]

On windows it seems to charge to 100%, but I’m testing different scenarios to make sure, on Android I’ve only been able to get it to 95%

[Martin Gorbush]

I thought so. Your battery cannot be charged as high as 4.35V which under Android it is interpreted as 100% charge. If you get 4.25V maximum then it will be something like 95% Android battery indicator. Even so those battery cell are rated for 4.2V as nominal. 4.35V is their maximum voltage. It shouldn’t be charged so much in daily use.

[Chris Clayton]

My Cube often seems to stop charging at 95% under Windows, but it also charges to 100%, or more often 99% as well. I have considered it to be just ‘inexactitude’ or a lack of perfection. How precise is the measurement and reporting anyway? My previous machine used to charge up to 110% — 120% if I let it. Was it telling the truth? As I understand it, in time the battery’s maximum capacity is going to start falling anyway, though I don’t know when this is likely to manifest itself.

I have not checked this out in Android mode — I will give it a try now

[brainvision]

LOL 120%? never saw something like that!

My personal suggestion: let the tablet discharge at -20% ( 😀 I mean until you can’t boot it anymore, nor Android nor Windows) and then charge it in the night while the tablet is still OFF. In the morning you’ll see the led not blinking anymore.. Remove the charger and boot the tablet to OS you prefer; once booted attach the charger once again and leave it again for an two hours max. Let it discharge again and repeat the process. Do it two times max and see if it helps..

On a side note, you could try using a specific software both on Widnows both on Android to see the voltage reached by the battery.. That % number is nothing but a convention, the important thing is the total voltage reached.

[Chris Clayton]

I switched to Android to check out the charging. Very smooth, up to 100% with tablet in use. Then stopped. Dropped a few % quite quickly. A few days ago while in Windows the blue light stopped flashing but remained lit as charging rose to 95%, but interestingly when I switched to Android the flashing re-appeared. So I suppose this suggests the lack of flashing is a glitch in the Windows OS rather than a fault with the machine?

I have been reading some of the many relevant articles on a site called The Battery University. One of them confirms the point about it being better not to charge a Lithium battery above <> 95%.

[Martin Gorbush]

Chris, as I mentioned before PMIC driver in the Android sets higher maximum battery voltage (so called CV charging mode) than in Windows. Your observation is entirely consistent with this. Also what “brainvision” said in his last words;) is true even if bigger part of his comment is offensive :(.

If “battery univesity” information is true then rising maximum voltage of li-ion cell by 0.1V shortens its life span (charge cycles) by half even if it allow that device to hold about 15% more charge. IMO this isn’t profitable exchange especially if you have many power sources around you (car battery, power bank, electrical outlet).

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[desteraa]

A faulty charger or cable might not be delivering enough power for a full charge.

Look for any battery saving features in your settings menu. You might find options like “Battery Saver” or “Optimized Battery Charging.” Disabling these features could allow the battery to charge to 100%.
A simple restart can sometimes clear up software glitches. Try restarting your Iwork 10 in both Windows and Android to see if it makes a difference.
Borrow a charger and cable from a friend or another device to see if the issue persists. This will help identify if the problem lies with your current charger or cable. Test your Uno mettle against a global audience –  uno online connects you with players worldwide.

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