I use 10 rechargeable nimh batteries in my Banshee and they work OK but take forever to charge and there is no level indicator to tell if they need to be charged or if I'm overcharging them. FoxPro has an expensive ($85) lithium ion battery but they offer VERY little information on it. I can't tell if it fits in the Banshee canvas holder, if it lasts longer than the nimh or alkaline, if it has a charge level indicator, or if it can be charged through a cigarette lighter. Anyone have experience with them?