[lipomax]

With 10L geared 18/66, I was getting peaks of 50-80 amps in first gear. First gear was taking me to 35 mph though. That's with 6s. With 5s, you'll be getting 30 mph in first gear geared 18/66 and peaks should be proportionally lower. Probably peaks of 40-65 amps. That's PEAK current. In second gear, you'll probably get peaks of 70-100 or so amps and top speeds of around 42 mph or so. With those peak amps, I don't think it would harm the 5s 4400 packs. Those 4400 packs can handle over 50 amps CONTINUOUS. I don't think you'll do much damage in first gear, but you might want to take care if you plan on running in tall grass in second gear for long periods of time.

Mike is absolutely correct with regards to batteries. The Kokams are the highest power/weight lipos I know of too. Definitely a difference in the "punch" (less internal resistance and voltage). But they weigh more for the same capacity. I guess they do this by having more metal in their lipos. The metal will have lower resistance, but weigh more as a result. For racing, I think the Kokams are the way to go. For bashing, I think the 4400's giving you that extra run time is the way to go.