DEWALT DXAEWPC4 professional 4-amp battery charger/maintainer features a robust waterproof design and waterproof connectors, making this the ideal charger even in the most challenging environments. It's perfect for motorhomes, boats, jet skis, lawn tractors, ATVs, snowmobiles, and vehicles that sit idle for months at a DEWALT DXAEWPC4-CA - 4 Amp Waterproof Battery Charger & Maintainer