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I've replaced a battery for someone who purchased a new, original battery from Acer (2020/04 is on the sticker). Other than the battery, the laptop (A315-21-49UK / NX.GNVSA.013) is pristine (was rarely used by an elderly lady who has since passed away). The interior of this laptop is as-new.
However, the battery isn't actually charging. I unplugged the SSD and inserted/booted a live Linux USB. It shows the battery as “charging 29%”, but if I remove the power cable, the laptop shuts off immediately. I do know about the battery reset button as well as the chassis button to press in order to power it up.
All connections are firm and secure. The power connector is intact. There's nothing visually wrong. I also tried another, known-good power supply and that gave the same results.
When the power cable is in and the orange “charge” light is on, the battery never gets warm. Eventually, one of the two lights will go blue, with the other orange.
BIOS is V1.02. I know some models need a BIOS update to deal with this issue, but if the original battery charged, why should I need to do this? I'm very hesitant to attempt a BIOS flash as I have no battery-backup if the power fails.
Thanks in advance!