I have 2 110 amp leisure batteries that I charge most nights using 2 intelligent battery chargers (6amps per hour), it reduces the charge when the battery is almost fully charged and just trickle charges intermitently when fully charged. I can run an extension lead out to my van, plug in the battery chargers when I get home and disconnect them in the morning when I go to work. I have no problems charging my batteries with these type of chargers as they are safe for slow charging. Car battery chargers work differently to leisure & gel battery chargers.