New iFixit battery draining quickly and phone heats up

Just installed a new iFixit battery for a iPhone 4s I own. It's a 32 Gb if that matters. The previous battery I bought drained very quickly too but the phone would not get hot from simple internet surfing. It would only get hot when I played any games. The previous battery was a China knock off by the way. I read somewhere on here that disconnecting the logic board would be something to solve this issue (is there any truth with that?) but wanted to know if there was someone that had this problem before and found a solid solution. Could it be a bad logic board or something else to cause the battery to drain so fast? Or another component that is bad. I replaced the front camera before the same time I installed the China knock off battery. Your help and suggestions are greatly appreciated. Thanks!