I recently got the Tenergy 4500mAh 8.4v nimh red stick packs with the smart charger, they are sold as a kit/combo on all-batteries.com. I am only running them in a v4 Bonzer I got for Christmas . So far I am not too happy [&o]. The 1800mAh 8.4v nicd batteries that came with the truck has more torque, a lot more torque [sm=48_48.gif], than the tenergy batteries have. I am getting 20-30 minute run times as opposed to 5 minutes with the stock. I am all about torque though! I have e-mailed them and I am hoping for a good response. Hopefully they are just dud batteries or they came from a bad batch. I have put about 6 cycles on them. Top speed is okay, but no better than the stock ones. The stock ones get to top speed much faster though. I will post results of the return e-mail.