Iphone 5 shutdown even with batteries?

So a while ago, i slipped on the stairs while i had my phone on the back pocket. Now it seems to shutdown everytime the batteries hit around 20-30 percents and the music/ipod would freeze and being unresponsive. How do I fix this? My warranty has expired already.

It sounds broken beyond repair. You will just have to live with it.

Broken motherboard

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