The Guest Company's Smart Leg Bluewater Chargers incorporate advanced technology to give each of your boat's batteries individual attention and automatically adjust to changing power requirements. Smart Leg Chargers provide a dedicated output per battery, delivering the exact amount of power needed to optimize your battery recharge cycle. Each is designed to differentiate between batteries and supply the necessary amperage, depending on the usage curve. This not only allows for the fastest, most efficient charging possible, it prevents problems such as overcharging. The chargers start at $199. The Guest Company, Meriden, CT; (203) 235-4421.