On Thu, Feb 16, 2023 at 1:42 PM <andreas.fourn...@runbox.com> wrote: > So recently I've started to get this problem that the laptop dies even > when the battery indicator says there is something like 40% left, i.e. > I never get a low battery warning. Then when I plug it in and restart > it also says the battery is at something like 40%. The laptop is about > five years old. >
Battery "health" can't be described by one number. Old batteries often have high "internal resistance" which means they work fine under moderate loads, but voltage will drop under high loads, causing a system crash. This is why batteries no longer viable for EV use can be repurposed for use in backup systems where loads don't spike they way they do in an EV. > > Is it possible to recalibrate the battery indicator so I would get a > warning when it is about to die? > I think you are outside the envelope where recalibration (which is more about the measuring device than the battery) is meaningful. -- George N. White III
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