I have several electric trucks and they all take two battery packs. I do own a Summit and I have to say it's probably my least favorite to use. I know it's not meant to be, but it's not very fast at all...I guess it crawls ok(don't do much of this anyway)? Some of the obstacles that I thought it could handle...it doesn't! Could be the driver though! The second day that I had it...both the front and rear axels broke...I hadn't even jumped it yet or driven it hard. Traxxas claims it was a bad batch and quickly warrantied the parts (a lot of people had this problem). On the positive side...it looks COOL! I'm a w/e basher and if I knew what I know now...I wouldn't have spent the money on it!