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I recently updated my Note 2 to 4.3 and it has been working quite well. But today in the train I was using it and the battery level drained to 20%, Since the battery was low, I switched it off and came home. When I put it on charge and turned it on- the battery level said 67%. How come it got such a boost? When I took it to work today, it had only about 56% and I come home with 20 and all of a sudden its 67% How?

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  • Are you rooted? It may be down to the battery being incorrectly calibrated.
    – RossC
    Dec 12, 2013 at 10:55

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This is a sign that you overuse your battery,frequently leaving your apps on....your battery is damaged and might need to be replaced...but till you can do that...you can always: 1.avoid charging overnight 2.use the correct charger 3.if you aren't using your data or wifi turn it off,to preserve battery life

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  • Oh. That would mean all my batteries must be long dead, and a ghost is working my devices: I 1) always charge them overnight, 2) rarely use the original charger (but simply take what's on-hand), and 3) never care about turning data off (except for "silent hours", where I send my devices to airplane mode). Also: How do you turn your apps off? Never heard about such requirements, sorry. That leaves a possible faulty battery, which I agree might be the cause.
    – Izzy
    Dec 10, 2013 at 20:28
  • you can use clean master to monitor all your apps and know the various apps consuming battery with du battery Dec 10, 2013 at 20:34
  • Yes, that's true. The stock settings also offer you means to find "big consumers". But that doesn't answer the question. OP is asking for an explanation of those "percentage jumps", not which app consumed how much battery. I've also never heard of "battery overusage", or that high load causes the described symptoms. No offense meant, but only "your battery might be damaged and need a replacement" could count as a partly answer to the question, and as assumption would better be a comment. Of course, that's only my opinion (unless upvoted ;)
    – Izzy
    Dec 10, 2013 at 21:14

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