This Unified Marine Deluxe Power Station Battery Box is #1 in the industry! You can determine battery condition at the touch of a button with easy accessory hook-up with the external terminals. No more hassles opening a standard box to get to terminals. 12 volt accessory socket allows use of common accessories. Charge directly from the external terminals. No need to open the battery box until the battery needs to be replaced. Ideal for small boats with no DC system.