sounds like the trickle charger i have , mine has no amp metter fitted so i guess the battery could draw a max of 1 and half amps thro this unit and i would not know , no problems yet with this unit , the battery that went bang for me was on a larger unit with a amp meter fitted but i thought all was ok when the draw started to fall as you would expect as the battery charges . ive learnt my lesson and only charge out side with the larger unit as it will deliver 4amps (if battery demand is there) and has no way to variable regulate like some ive seen .