Let us know how it goes. I've picked up 2 packs on eBay - pretty good price for a couple of 4500 packs. Been using them for B4 and TC3 racing and they handle the load well. I think we can say they are good packs at a good price. I also think they're available direct from www.all-battery.com. I would say the Tenergy are close to the Elite 4500 packs I have. They're also lighter than the Elite 4500s per-cell. Elite has a 5000 mAh cell out now at www.cheapbatterypacks.