I agree with crappiedoc about the batteries lasting longer if you charge when you get home. You should always recharge first thing. But I will also say I have never had a problem with having to fill my batteries more often because of the on board chargers. Think of a car battery that is constantly charged every day. I hardly ever have to put water in my car battery and the alternator is charging it any time I'm driving it. I have read that it is much better to keep your batteries on the charger all the time.