you are correct, plus the more plates/size, the more amps. to understand charging, current flows out the positive side, to recharge, you send the current backwards through the battery forcing the acid out of the plates, the slower you do this, the better , kind of like digging in a sand pile, you can dig fast, but sand will fall back in the hole and after a few minutes you have something of a hole dug, the sand falling back in the hole is like the acid going back into the plates, but if you dig the hole slow and easy, sand doesn't fall back in as fast, takes longer, but you have a bigger hole and the sand isn't falling in as fast, does this make any sense?