The battery had to be recharged almost 3 to 4 times a day. Playing media caused it to go from full charge to half in a matter of minutes.
Process was easy with the teardown guide. Just followed it step by step and it was done in less than 30 minutes.
Having a pair of tweezers to reconnect the proximity / earpiece cable would have been better. I have now had to reopen the iphone to reconnect because I would lose audio and the proximity sensor would not work.