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I have an iPhone 4S and I just ran into a really weird issue the third time now: the battery percentage would suddenly drop 30-40-50%. One minute, it's, say, 69%, the next minute it's 25%. If I put it on a charger, it jumps back to 69% after a few minutes and charges it until 100% and then it works for a while.

It happened again today, I noticed that the camera apps were getting killed even though the battery was at 54%, and then after a minute, the battery would drop to 1% saying low battery. Then it died on me.

I also do not know how to calibrate.

I'm running iOS 8, non-jailbreaked.

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I'm afraid that doing the hard reboot at the end is necessary for the calibration. Try it, and tell us if that solved the issue. –  Thecafremo Mar 12 '13 at 8:48
    
Try restoring it and check the differences. –  Rob Mar 12 '13 at 9:17
    
I'd wager this is a hardware issue. Software problems don't tend to manifest in such ways. It's likely a faulty battery. –  cksum Mar 12 '13 at 9:23
    
I'm curious if the phone will actually die when it reaches 1% or less. So, if you just let the phone go (not charge it), when it jumps to ~25%, does it discharge from 25% percent like you would expect, and then power off? –  bassplayer7 Mar 12 '13 at 16:29
    
My phone is doing the exact same thing. It isn't all the time, but occasionally. One day I went from 57% directly to 18%. Today I went from 37% to 20%. As soon as I put it on the charger it goes back to the percentage it was at before the drop. –  user47031 Apr 8 '13 at 21:35

1 Answer 1

up vote 1 down vote accepted

I ended up replacing the battery myself. Have no issues with the new battery.

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This sudden drop in capacity is a typical indication that the lithium polymer battery has exceeded it's normal useful life. It could also be a premature failure of the battery, but either way the solution is to get it serviced or replaced in almost all cases. –  bmike Nov 18 '13 at 22:02

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