The Guest 2635 ChargePro 35-amp four-bank marine battery charger provides safe, fast charging in a rugged package. Waterproof and protected from shock and vibration, the charger is impervious to corrosion and caustic gases and uses switching-power-supply technology. The 2635 ChargePro reads the needs of the battery and uses three-stage charging to deliver the correct voltage. The unit can safely charge lead-acid, gel cell or AGM style batteries. The Guest 2635 ChargePro has a suggested retail price of $430 and comes with a lifetime guarantee against water damage. Marinco, Napa, CA; (707) 226-9600; www.marinco.com.