Sweet vid's. Thanks for posting!
I wouldn't go with the 4100's as I tried a set as soon as I got the truck and the power output from the packs is really good but the runtime isn't anything to brag about. This truck sucks the juice and I would recommend at least 5000mAh plus. Our 5200mAh 24C packs are selling for $85, pt.# 5224LD. These are the packs that several of hpi's marketing, & promotion guys use(John Schultz, Collin Coccores, just to name a few). No matter what brand you choose, def. go with 5000 or more mAh.
The people asked, and hpi really delivered with this truck. Insane power, endless durablitity, and an absolute blast to drive.
Bryan @ SMC