I was looking at the data sheet on the 12V 1.2AH SLA battery I am purchasing, and it states a maximum charging current of .36A. If I am running a 10W auxillary headlight bulb, and a tailight pulling around 3 watts, that is a a drain of 13W @ 12v = 1.08A. So if my battery is charging at .36A and I am discharging it at 1.08A, it seems like the battery will eventually drain. So it only makes sense to let the battery charge at a higher current since there will be about 4 to 5 amps available. Don't know what the consequences would be with this particular battery. The discharge time at .72A is around 30 minutes for this battery. I need to look over everything again. I'm just not sure how those Regulator/Rectifier all in one devices are designed. Their must be some extra circuitry in their to accomodate for these things.