Thats an old school charger before they all came with a ballancer built in, and you need 2 batteries to run in a brushless revo. Maybe you could sell all that stuff and use the money for something else you need?
I do have another battery I just didn't picture it, I also have a pro peak Sigma II EQ Lipo charger but I didn't know how to wire them up to that either and seeing as the previous owner had them wired up in this configuration I wanted to keep it the same really...