TTR S3 BL Conversion

Hey guys, I'm new to brushless 1/8th scale's, and had an almost new TTR S3 laying around and figured I would give it a go. I ordered a RC-Monster Motor mount for the TTR ST-1 which should fit, as well as a Mamba 2200 ESC/Motor Combo. I plan on using 1 4s lipo. Does anybody know if I need 2 separate batteries to be able to race? Here are some pictures getting it prepped. Lemme know what you think.