Could be that battery wasn't up to snuff, some mods have a catch all error code for a lot of stuff. Since it works with the other battery, I'd charge up the other one and try it again, if it happens again, then you know it's a bum battery, or a battery that can't handle the load. BTW, if you have more then 1 battery in the mod, those batteries must be the same type and manufacturer (married). When you change them out you change both of them out, and keep them for use on that mod only.