I just ordered a 80lb 24v Terrova today, to replace my 12v 55lb powerdrive. I have a double battery tray coming in the mail and two new trolling motor batteries. I don't have the money for a onboard charging system right now. When this is installed and used can I hook a seperate charger to each battery with no problems. Or do I have to unhook my wires from each battery to charge? I have two battery chargers so charging won't be a issue, just would be nice to know if it is safe. Thanks.