Since you mentioned Battlebots, I wanted to mention that when I was on Battlebots in 2002, the options for batteries were pretty damn slim. The was one company

Since you mentioned Battlebots, I wanted to mention that when I was on Battlebots in 2002, the options for batteries were pretty damn slim. The was one company making a good product called Battlepacks (for lightweight - super heavyweight classes). If you were doing anything in the smaller weight classes (antweights through the 30lbers), you were typically hijacking a lot of remote aviation resources. The options available now are much better than they used to be.