Thanks for the manual on the Schumacher EC-4000-USB e-charge battery. Somehow we have lost the 110-volt AC charger - does anyone know if I can buy a replacement for a reasonable cost? I went to the manufacturer's website and searched for the unit and it doesn't even show up? I will try to charge the battery via a running car outlet - hopefully that might be the best solution. Thanks for the manual - it helped me out of this jam for sure.