RCU Forums - Please help! RTF electric p-51 question

Ok, so my father in law is giving me an art tech p-51D foamie rtf that his son never flew (I fly RC models but it's been a while and I only flew glow). I am really new to electric rtf's although I'm excited as I am hoping to get a few warbird foamies and some EDF's in the future now that I'm gettin' back into RC flying. My question, is about the 11.1v 1300 mah li-poly battery that came with the model. It is all puffy and I know it's dangerous and so I am disposing of it. However, where can I get a replacement (the two places online i found this kit they were all out of stock and couldn't find the battery). I'd prefer to just buy an extra battery from art tech but if I can't then could someone tell me where I can get a replacement that is compatable with this rtf and, more importantly, the esc that's with the plane? I think the plug type might be called a dean's female??? I really have no idea. Any help would be GREATLY appreciated! Thanks!