Battery Maintenance Charger. Fully-automatic on-board charger provides a 1.5 Amp maintenance charge. Designed to maintain 12V batteries. Water resistant with safety features like short circuit connection and reverse polarity protection.. LED status indicators. 1.5 amp. 12V. 1 bank operation. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.