Battery health keeps decreasing in KDE

Recently i am facing some issues with battery where my battery health keeps decreasing in KDE. If my battery health is around 58%, then when charging the battery, if the current charge reaches to 58, it suddenly reaches to 100%. After that battery charge draining to 58% and my laptop is shutting down saying battery is 0%. How to overcome this problem?

How old is the battery?

It’s around 5 years old.

Honestly it sounds more like a faulty battery than anything within the OS - to test further, I would fire up a live CD of whatever and let the machine run the battery flat to see how it behaves.

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I would also apart from thinking fault in the battery check the BIOS/UEFI for settings related to this, some are a bit finicky

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