I use the 1100mAh Hump pack as well, and although I've not timed it, I'd say it lasted about an hour total, the last time I charged it? It's only been charged 2x though, and never trickle charged like it should be, so it might last even longer if I ever get a charger that can charge it properly? At the moment I just use an old "peak" nicd charger I have, and charge it at .5 amps.. Took about a 1/2 hour to peak.. But I've read that you should trickle charge a new pack, for like 11 hours @.1 amps to get it to accept maximum charge? (I dont know a whole lot about batteries, butthe short answer is,it lasts alot longer than the 4 "AA" energizers I started with..)

I also upgraded the steering servo.. I got a 208oz. jobber from ebay.. It's fast and strong!Turns those big tires with ease! </p>