To the people that use their Thunderbolt without a case or extended battery... How does the phone hold up against the outside world? Does it scratch easily on the edges? Does it get scuffs? ill be useing a screen protector so the screen will be fine. and, also when i squeeze the battery cover from the sides, it makes a squeaky noise and moves. like not a lot but when i apply pressure it goes in like plastic would. idk. but does this happen to anyone else? is this normal to everyone? or should i go take the advantage to go get a new Tbolt on the 13th day i have it?