PH315-52 Battery only charges up to 99%, increases to 100% after some time off charge

TheIrishNinjas

Hi,
I have noticed odd behaviour with the battery of my Acer Predator Helios 300 PH315-52 laptop recently.

For some reason, whenever I am charging the laptop it can only go up to 99%, after which Windows claims that there is 99% available and it is charging. The Battery Percentage Icon widget, Hardware Info and BatteryInfoView both support this with the former showing I have 99.0% and both others reading at 99.4%. However, once I plug the laptop out it stays at 99% for quite some time (approximately 20 minutes to half an hour) before *rising* to 100% briefly and then decreasing at a normal rate.

I mostly keep the laptop on charge but do need to use it on battery relatively regularly, during which it depletes at a rate of around 40% an hour once it is at 100%.

Any idea what might be going on here? 

EDIT: I have just reinstalled the battery driver with a full shutdown instead of the recommended restart and it's now at 100%. Not entirely sure if that was a reliable fix or not, only time will tell I guess.

Thread was edited to add model name to the title

JackE

Nothng's going on. Windows battery charge widgets aren't terribly accurate or stable and reflect normal battery capacity deterioration as it ages. Anywhere from 95-100% is considered full charge. My laptops do the same thing on Windows. Linux widgets seem better. If they get too far out of line, then re-calibrate  manually or with the Acer Care Center app if it has the feature.

https://community.acer.com/en/kb/articles/140-calibrate-your-battery-using-acer-care-center

TheIrishNinjas

JackE said:

Nothng's going on. Windows battery charge widgets aren't terribly accurate or stable and reflect normal battery capacity deterioration as it ages. Anywhere from 95-100% is considered full charge. My laptops do the same thing on Windows. Linux widgets seem better. If they get too far out of line, then re-calibrate  manually or with the Acer Care Center app if it has the feature.

https://community.acer.com/en/kb/articles/140-calibrate-your-battery-using-acer-care-center

Thanks for the reply! It seems to be back to normal now after reinstalling the battery driver twice and doing a bit of recalibrating, it occasionally hangs on 99% still but unplugging the charger and plugging it back in seems to fix it.

Easwar

Hi @TheIrishNinjas,

Overheating a battery will shorten its life, so some computers stop charging at 99%. Macbooks in particular are known to fluctuate between 97% and 99% when plugged in to “condition” the battery. If it stays at 99% even after long use unplugged, you may need to recalibrate it. Some computers let you do this in the BIOS.