Nope I use one while one charges (remember) It runs every thing being a Class 3 ship I get to change between Sorties. I randomly check it when it comes off and there is still 7.5 or better. On the charge I think I even ran it for both at Robs once if I recall correctly and had no issues
Sorry about that Monk, I thought I had posted about the e-bay site on my Kumano build. Actually the 3800 mAh with the charger is a great deal for a cruiser, buy 2 of them, and you have 4 batteries, and 2 chargers for under a $100, can't beat that, good for the whole day. Frank runs his Russian KK light cruiser on 1, 4500 mAh for 2 sorties. In my Kumano I'm running 3, 4500 mAh in the boat just to meet the max weight, with only 2 hooked up, and they lasted 2 sorties with no problems.