if you dont use a car frequently or a tractor or a generator excellent choice five stars an outstanding product works great great customer service help line exactly what your after if your looking for a battery maintainertrickle charger perfect but who would expect less perfect for a boat or rv battery good to use on a battery that doesnt see much five stars works great great performance i ordered five more for atvs and side working well so far two different connection allowing for you to leave part very pleased with performance and have recommended it over another well delivery sucks now used to be great