I really like your setup FloridaBill. I have a charger for my fleet of RC Birds, it can charge nimh/nicd, pb, lipo (Lithium) Packs, the voltage and amps can be set any way you wish, fast charge, or slow. It even has a temp probe, and a PC interface adapter, to monitor voltage and charging via computer. It's a Thunder AC6 Bought it new for $43.00 I wish they made a 9V (Lipo)-Lithium Battery for my detector and pin pointer. Some of my RC Helicopters fly on a (3 Cell) (2200mah) (11.1v) (20C) with a weight of only 6.8 Oz fully charged @ 12.4V. Mega Power in a small pack. These type of packs, are a fraction of the weight for the power they can provide compared to AA/AAA/C/D/9V Ect. My pack that only weighs 6.8 oz can crank a riding mower. I hope future metal detectors use lipo packs.