SARMCG51, seeing such a quick drain on the battery would definitely cause me to be concerned. I welcome the opportunity to assist you with this. The best way to see what's causing that drain would be to check under Settings>Battery and then viewing the usage at the bottom of the screen. You can view the last 24 hours or last 6 days to see if anything in particular stands out. If the percentage value for an app looks to be abnormal, please let us know.
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If you have fast battery drain, random reboot and overheating problem with any Windows phone devices this not related to Windows 10 Mobile or any build. This is just because most of the Windows Phone devices are older than a year or two so the battery is expired.
Replacing the battery will fix fast battery drain, random reboot and overheating problem of Windows Phone. I had same problem, I replaced mine now I don't have any problem. I highly recommend you to replace your battery if you have same problem .
The OP posted their question in the Apple space on the an forum. It is likely they have an iPhone and not a Windows phone.
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