hello guys, my moms camera for the 4s needs replacement. ive ordered a replacement for 18 dollars on ebay. Can i leave the battery on (with power off) and just take out the metal cover and swap it with the new camera module? or is it a MUST to remove the battery because of circuit issues when the phone is essentially turned off already? its very easy to just remove the camera without taking the battery off(was poking around before) . Thanks!!