So just get the battery out with pliers? I don't want to have to deal with soldering on it until I have to, but that battery has to come out soon, hopefully it hasn't done much damage.
Go down to the nearest Radio Shaft (er, Shack) and get a pair of nippy cutters, aka flush cutters. They'll become your best friend if you do any soldering/circuit board work.
I picked up 4 pair last time just to make sure I could always find a pair when I need them!