My iphone 5 battery overheats?

My phone charges normal but suddenly the battery heats up and drops my batteries life in half? Mahouts I just take it to tmobile to get a new one?

Is it new or old meaning the phone, is it the normal battery or aftermarket battery. If its new take it back get it replaced under the 1year warranty

Slap a new battery in it, that probably will fix your problem. Batteries are cheap

I got it April of 2013 so i pass the 1 year warrenty. I got insurance with tmobile up program I believe it's called