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My iPhone 5s battery is being drained very fast when in sleep mode (30-40% over night). I put it in airplane mode and in low power mode, and it still drains very fast in sleep mode. The battery however is fine during the day, lasts about 3/4 of my day when I use it.

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It's possible that the battery health has degraded over time. I would recommend you install Battery Life in your iPhone to check the battery health. If the battery health is below 80%, then you should consider replacing the battery. I replaced my iPhone 5's battery after 3-4 years after it hit 65% battery health. You should do the same. I was able to find a 3rd party battery and replace it myself. The process took me 30-40 mins. Also, go to the Battery section in the Settings app and see which apps are the biggest battery users.

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    What about the battery usage stats? Which apps consume the most? You can also make certain apps use location services only when open via Settings app. That way there aren't too many apps using GPS in the background and possibly draining battery.
    – btrballin
    Commented Aug 15, 2017 at 21:18
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    Which apps are listed under the Battery section in the Settings app and what percentage of battery did they drain? Perhaps it could be some app using background services quite a bit. Did you try quitting all the apps before going to sleep at night?
    – btrballin
    Commented Aug 17, 2017 at 17:49
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    Again...which apps are listed in the battery section of the Settings app? I asked this question several times but you only seem to respond to my last sentence.
    – btrballin
    Commented Aug 18, 2017 at 17:28
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    This is a very odd issue. I honestly don't know why it drains faster overnight night than during the day. The only thing I know that drains battery overnight is the Sleep Cycle app that tracks motion as you sleep. If that's not the case, your best bet would be to leaving it charging overnight. That's what I always do. Nothing will happen to your battery if you do that because the iPhone charges at varied rates. Once it hits 80%, the rate of charging slows down. So your phone will do fine being charged overnight. Since even the Battery Life app said 0% wear level, the battery itself is fine
    – btrballin
    Commented Aug 19, 2017 at 21:41
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    I meant faster than it should in sleep mode. Maybe uninstall unnecessary apps and reboot your device to clear memory. Also keep in mind that 5S is a very old model. I wouldn't be surprised if you are only getting half a day of battery. You should Google "iPhone battery drain sleep mode" and try the solutions they have to offer. It could potentially be a hardware failure.
    – btrballin
    Commented Aug 24, 2017 at 17:05

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