I'm looking to figure out what case is better for every day use. I like the mophie but the one I have is rattling? It never loses connection but I can here something moving in there with the phone out. I've looked at this energizer battery pack at target, on sale for $22 but there is no off button. So it tries to charge the phone every time the battery drops a hair. Is that bad for the phone? I like the feel of that case better than the mophie bc its rubber and I wouldn't have to worry about the case top falling off when I try to pull it out of my pocket. Guess my questions are What battery pack do you rec/use and would the energizer one hurt the phone if its always trying to charge it till the case dies?