Lloyd, you mentioned that two of the original ribs were not going to be used. which ones are you referring to?
Put in parallel for 12v 10ah they will work, but you wont get fantastic runtime, there just isn't a lot of capacity there vs what you'll burn through in combat. Atleast if you're going fast-gun. Big-Gun, because of speed differences, motor selection and rules differences, I don't know what the battery expectation would be.
