Acer Aspire ES 15 turns off after unplugging charger

May 28, 2018
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As the title says, the laptop will turn itself off when not plugged into the charger. Exact model number is ES1-531.

It seems to take about 10 seconds before it suddenly decides to shut off, and will not turn back on unless plugged back in.

I've checked the Wear and Voltage with HWMonitor, Wear is listed at 9% and the voltage while plugged in is 13.1v, and once unplugged drops to 12.7v.

Both Windows and HWMonitor show the battery as being at 100% while plugged in, followed by a drop to 99% once unplugged, before it shuts off.

I'm assuming that it's just a plain and simple dying/dead battery, but wanted a second opinion just in case.

Thanks for any help!