I replace batteries in games all the time, but this was me fixing someone else attempting to do the same with bad solder/tools. The solder they used was NOT meant for small parts, was near impossible to remove and it was splattered over to a rom chip bridging several legs of the chip together making it to where it wouldn't even load the game. But DrGAKMAN saved it using flux, braid and superior skills I was able to un-bridge the fused legs and make it playable again. the DOCTOR is in!