Nexus 4 shutdown issue

A

AC Question

So it seems after I updated from both 4.4.3 and 4.4.4 my Nexus 4 will say that I have at least 50% of battery, then it just shuts off and says its completely dead after a short amount of time, where usually it wouldn't die in me...

Also my Nexus 4 cracked on the back and in the place it cracked the most there is a small bump sticking out of the phone not sure what it is.. After I bought the phone (used) the seller said he got a new battery put in, not sure if thats the issue or not. (Crack is on left side of phone around middle area)
 

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