Battery Doc 12V 1.25A Sport Battery Charger/Maintainer safely maintains and charges batteries in stored vehicles/equipment when not in use. In-line battery charger and maintainer includes a lead with alligator clips and a lead with ring terminals that are interchangeable. This means you can leave the lead with ring terminals connected to the vehicle/equipment for easy plug-in when needed. Features reverse hook-up protection/spark resistance and easy-to-read battery charge status LEDs. Charges and maintains batteries from 5–200 Amp Hours. Maintains batteries up to 400 Amp Hours.