Choosing (and Finding) a Dual Battery Box

The purpose of a battery box is prevent the battery from moving, contain any possible leakage (as rare as that may be), and to prevent any foreign objects from coming in contact with the positive terminal.

If you have a significant house battery setup and are running two batteries (in series or parallel), you may be in the market for a dual battery box to conserve space, remain safe, and keep things tidy.

The problem is, out-of-the-box solutions are limited for double battery boxes, and the interior dimensions are often hard to determine when shopping online. The purpose of this article is to organize many of the top battery box options and their specifications to help you make the right choice for your needs.

highlight-arrowNote:┬áMany of these boxes denote the “group” size batteries that will fit inside it. To determine what group size your battery is, refer to this chart.

Available Dual Battery Boxes:

Quickcable Dual 27, 31 Commericial Battery Box

Assuming it will fit your batteries (size 27 or 31 will both work), this Quickcable dual box our favorite pick. It’s incredible sturdy, relatively compact, and we think the thumb screws are the most accessible/well-made out of the list. If your electrical setup isn’t the tidiest, you may like the fact that the 3-way cable channels are wide and well-designed, and large entry ports are perfect for for heavy duty (or multiple) cables.

Outside dimensions:
20″(L) x 21″(W) x 12.5″(H)
Inside dimensions:
14″(L) x 15″(W) x 10.5″(H)

NOCO HM485 Dual 8D Commercial Grade Battery Box

Another top-quality option, the NOCO double box has excellent ventilation and fastens securely on all four corners. A little pet-peeve of ours is that the screw knobs don’t have a whole lot of room around them (they’re protected by a ridge to prevent accidental loosening). So long as you don’t mind this, the NOCO box will serve you well for two 8D (standard) 12V batteries.

Outside dimensions:
26″(L) x 24″(W) x 12.5″(H)
Inside dimensions:
23″(L) x 21″(W) x 10.5″(H)

Quickcable end-to-end 8D Battery Box

If you are building/converting your own campervan, you know that there’s a dozen ways to design your interior. It’s basically one big puzzle. Just like one of those “long and straight” pieces in Tetris, the Quickcable end-to-end box can be a lifesaver. It’s ideal for pushing against the wall underneath a bed, or you can build lower shelving around it. A little pricier, but if your interior design calls for it, you may not have a choice.

Outside dimensions:
49.5″(L) x 18.25″(W) x 12.25″(H)
Inside dimensions:
42.5″(L) x 12″(W) x 10.75″(H)

Moeller Roto-Molded Marine Battery Box

Designed primarily for boating applications, this Dual Marine Battery Box is well-made at an affordable price tag. While other boxes on this list have comfortable screw knobs, this has simple wing nuts, but they get the job done.

Outside dimensions:
27.6″(L) x 24.6″(W) x 14″(H)
Inside dimensions:
24.25″(L) x 21.25″(W) x 9.5″(H)

TORK LIFT Secure Aluminum Battery Box

Depending on your situation, you may not want your battery box inside your cabin at all. Some choose an exterior solution, like this TORK secure lockbox, which can attach to the rear trailer hitch, provided you purchase additional mounting options (the box comes with basic mounting hardware, but not for a hitch). This is more of a general locking box that can also fit two 12V batteries, so with the increased price tag comes more flexibility and use cases.

Outside dimensions:
30″(L) x 11″(W) x 13.5″(H)
Inside dimensions:
23.8″(L) x 8.2″(W) x 13″(H)

Dual Battery Holder Tray

Maybe you’re beginning to realize that a dual battery box isn’t necessarily for you. You may not have the space, the budget, or the necessity for those extra safety features. If you’re simply looking to keep your campervan’s dual battery setup organized and connected, you might look at one of these inexpensive dual battery trays. This will ensure the batterys stay seated firmly against one another, preventing any undue stress on the connections and terminals.

Dimensions:
14.5″(L) x 13.2″(W) x 1.2″(H)