Maintain your battery's charge in storage and during the off season with the BLACK+DECKER BM3B Battery Maintainer and Trickle Charger. Featuring fully-automatic, high-frequency charging, this maintainer conveniently keeps your battery charged without the need to monitor battery levels. The unit provides a charge when needed and stops when the battery is fully charged or topped off. The BM2B battery charger works with both 6V and 12V AGM, GEL and WET batteries, and it switches between voltages with a simple toggle. The fully-automated charger is ideal for use with RVs, classic cars, specialty vehicles, ATVs, snowmobiles, jet skis, motorcycles, marine deep cycle batteries, lawn mowers and more. For safe use, built-in circuit protection to prevent overcharging, reverse polarity and short circuits. The batter charger includes battery clips, 12V DC accessory plug and battery ring terminals for three ways to connect. Take the guesswork out of charging and maintaining your battery with the BLACK+DECKER BM3B Battery Maintainer and Charger. CEC and UL listed.