IPhone switches off with 10-20% battery after installing iOS8

I've upgraded to iOS8 on 17th.
Since then, the iphone now switches itself off when battery is around 10-20% of battery.
very annoying.

Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, tap Settings > General > Reset > Reset All Settings
No data is lost due to a reset.

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