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Originally Posted by T-Man
3% left, seventeen minutes to go... I know it "slow charges" when it gets so high, but this seems too slow, eh?
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By freak coincidence, my battery was at 97% and charging when I read this post. I laughed when I clicked to discover…wait for it…exactly "0:17 until full"!!! My battery is of comparable age to yours, so I think this is probably normal. It's certainly how lithium-ion batteries normally behave during charge (fast at first, then slower and slower until finally fully charged).
Lithium-ion batteries and their associated charging circuitry are complicated things. Learning all their idiosyncrasies is probably not worth the time. As long as the battery charges in a reasonable time and gives a reasonable life (for example, at least 75% of new life) then I wouldn't worry about it.