Why is my HTC One M8 constantly switching off even though the battery is fully charged?

[AC Question]

My htc one M8 is constantly switching off even though the battery is fully charged.

Once the unit is plugged on to a power source it works. Once it is unplugged it works for about two minutes and then cuts off.

 

[B. Diddy]

Re: My htc one M8 is constantly switching off even though the battery is fully charged.

Welcome to Android Central! The battery is probably failing. You'd have to bring it to a repair shop to replace the battery.