Review on Mroinge Automatic 6V/12V Trickle Charger For Vehicles, Motorcycles, Boats And More - Maintain Your Batteries With Ease! by Dave Harris

I bought two of these. One is for a vehicle that is stored through the winter. The other is for a zero turn mower that is also stored. The units both brought the batteries up to full charge within a few hours, and have maintained a fully charge status for the last month. Only time will tell how well they do over the long term. At 1.5 amps, they should have the power to keep the batteries charged.