Whilst using my ProBook 4510s on battery, it suddenly died. Plugged into the mains, and it works fine. However, the battery does not charge and the battery / mains icon says "On AC Power" - it used to say "Charging xx% yy minutes remaining". In teh three days since this happened, the battery power meter has progressively shown less and less charge, dropping from 38% to the current 25%. I don't think this is a battery problem - any clues, and is it worth having a 3-year old ProBook repaired? Or is there a simple fix I can do?
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I would try a new battery first. it could be any number of issues, but the cheapest and easiest way to attempt a fix on this issue, would be try another battery.
In my opinion,your battery is bad,too old.You should change a new one.