Is a battery Pit-stop possible?

I've been racing a E-CRT truggy. I'm about to get some kind of E-Revo, on the fence between the genuine article and the possibility of doing a conversion. My E-CRT has two packs now and the new E-Revo also uses two packs. Can't help but feel like I keep fighting a loosing battle. Either I run with huge and heavy high capacity packs to make 20 mins which diminish the agility of the vehicle or I change mid-race at a massive time penalty.