The Clark stacker's 12-125-13 750 AH battery has sat idle for a month and was down to about 23 volts so even though no "correct" charger is available, I'm charging it with a 550 AH automatic charger. I'm bringing a "correct" hi-capacity online but it'll take a while to be ready for use. Am I going to ruin the battery by using the "single shift" charger for one charge? How about if I recharge 3 times using it? This charger begins the charge at 40 amps and ends at 16 amps, after it thinks the battery is charged, a yellow light comes on. This charger has the Exide name on it, pix avl if desired.