Best Dual Battery Box For Trailer Tongue: Compare 7 Options

#1 · Best Overall

1. Peastorm Dual Steel Box

• Size: Double battery series (black)

Best for: Lockable Steel Dual-Battery Relocation.

Why it ranks #1: Designed for a double-battery series and includes bottom fixing holes, screws, handles, rubber-protected openings, and a lock for its cover.

A lockable upper cover and handles on both sides distinguish this peastorm dual-battery box. The supplied lock and lifting points support a relocation setup where access and handling matter, while rubber rings protect its multiple reserved openings and bottom fixing holes provide a specified mounting route for a trailer or RV installation.

The quality steel construction has a black surface coating and is described as waterproof, sunscreen, and fireproof, giving buyers a metal enclosure for listed car, marine, RV, trailer, and kayak uses. Handles on both sides can assist when positioning the box, while the bottom fixing holes and included screws support attachment. Rubber rings protect the multiple reserved openings, and the lockable upper cover includes a lock. The product is described for a double-battery series setup.

Skip it if you need published internal measurements before planning fit; the Camco Double Battery Box lists its inner dimensions for GC2 and Group 24/24M batteries.

This suits a buyer seeking a lockable steel relocation enclosure for a dual-battery series setup on a trailer, RV, or marine application. Because internal dimensions are not supplied, verify that the box and batteries work with the intended mounting space.

Listed on Amazon as: Peastorm Trailer RV Marine Battery Box – 12V Waterproof Steel Dual Battery Relocation Kit for Boat, Trolling Motor, Kayak (Double Battery Box Black)

#2 · Stainless Construction

2. Peastorm Dual Stainless Box

• Size: Double battery series

Best for: Stainless Dual-Series Relocation Setup.

Why it ranks #2: This stainless-steel double-battery relocation box is described as waterproof and includes bottom fixing holes with screws and a supplied cover lock.

Stainless steel construction is the defining feature of this peastorm dual-battery relocation box. The listing describes it for a double-battery series setup and identifies trailer, RV, marine, and camping uses, while a lockable upper cover and handles on both sides support access and handling during installation.

The stainless steel enclosure is described as waterproof, sunscreen, and fireproof, providing the stated environmental characteristics for its listed vehicle and marine applications. Handles on both sides can assist with positioning, and the lockable upper cover comes with a lock. Rubber rings protect multiple reserved holes, while bottom fixing holes and included screws give the installer specified attachment points. Since dimensions are not supplied, the listing offers no measurements for comparing battery size or available trailer-tongue clearance.

Skip it if you need stated interior measurements to check a large battery pair; the NOCO HM485 lists dimensions for two Group 8D batteries.

This peastorm is suited to buyers wanting a stainless dual-series enclosure with a lock and mounting holes for trailer, RV, or marine use. Its missing dimensions make advance battery and tongue-space measurement essential.

Listed on Amazon as: Peastorm Trailer RV Marine Battery Box – 12V Waterproof Stainless Steel Dual Battery Relocation Kit for Boat, Trolling Motor, Kayak (Double Battery Box)

#3 · Broad Battery Fit

3. Camco Double Battery Box

• Size: Double Battery Box

Best for: GC2 And Group 24 Pair Storage.

Why it ranks #3: Fits two 6V GC2 or two 12V Group 24/24M batteries, and includes two straps and four strap clamps with screws.

Two battery formats fit this Camco box: it holds either two 6V Group GC2 batteries or two 12V Group 24/24M batteries. That flexibility lets trailer owners select the enclosure around their battery type, while the included straps and clamps provide a specified way to secure the pair.

The 211⁄2-by-73⁄8-by-11 3/16-inch inner space gives buyers concrete dimensions to compare with a trailer tongue or battery pair before installation. Its heavy-duty, corrosion-resilient polymer is specified to help protect batteries, and the two straps with four screw-on strap clamps provide securing hardware. When used with two 6V Group GC2 batteries, the box meets U.S. Coast Guard CFR 183.420 and ABYC E-10.7 specifications, a relevant detail for marine use.

Skip it if you need a steel enclosure with a lockable cover; the peastorm double steel box includes a lock and rubber-ring-protected openings.

Choose this Camco for a trailer or RV pair using the listed GC2 or Group 24/24M formats, especially when straps and clamps are useful. Check its narrow internal width against the batteries and available tongue space before fitting.

Listed on Amazon as: Camco Double Battery Box – Safely Store RV (& More) Batteries – USA Made

#4 · Published Dimensions

4. Sidasu Stainless Dual Box

• Weight: 11 lb

Best for: Dimension-Checked Stainless Dual Storage.

Why it ranks #4: Lists internal dimensions of 21.7 by 8 by 11 inches and stainless construction, helping buyers check fit before purchasing.

Stainless steel construction and published internal measurements are the key buying points for this Sidasu dual battery box. Its 21.7-by-8-by-11-inch interior lets trailer owners compare the available space with their batteries before committing to a tongue installation, rather than relying on an unspecified fit.

The stated 22.6-by-9-by-12.2-inch external dimensions help assess the enclosure’s footprint, while the 21.7-by-8-by-11-inch interior narrows the battery-fit check. The listing specifically excludes extra-large batteries such as 4D, 8D, Wide 31, and Wide 65, as well as batteries wider than 8 inches or taller than 11 inches. That makes measurement particularly important for a dual setup: compare each battery with the stated limits and account for available trailer space.

Skip it if you need an enclosure for two Group 8D batteries; the NOCO HM485 is sized for that battery class.

Consider this Sidasu when stainless steel storage and explicit dimensions match your trailer-tongue planning. Its stated limits exclude several large battery types, so confirm both batteries fit within the 8-inch width and 11-inch height before selecting it.

Listed on Amazon as: Stainless Steel Dual Battery Box 12V Waterproof Marine Battery Storage

#5 · GC2 Battery Fit

5. NOCO HM426

• Weight: 7 lb

Best for: 6V GC2 Trailer And Solar Pair.

Why it ranks #5: Fits two 6V GC2 batteries with internal dimensions of 14.6 by 10.5 by 11.5 inches and a four-corner fastening system.

The NOCO HM426 is specifically sized for two 6V GC2 golf-cart-size deep-cycle batteries, making it a focused choice for a paired trailer bank. It can keep two batteries wired in series for 12V together, with a captive lid hold-down and four-corner fastening system among its listed features.

Its 14.6-by-10.5-by-11.5-inch interior helps buyers compare GC2 batteries with the available trailer-tongue space, while the 17.9-by-14.3-by-14-inch exterior indicates the larger mounting footprint. Full-flow ventilation is specified for the enclosure, and the captive lid hold-down and four-corner fastening system address lid retention and attachment. The listed RV, camper, travel-trailer, boat, and off-grid solar uses make it relevant wherever a pair of 6V batteries supplies a 12V bank.

Skip it if you need a dual enclosure for Group 8D batteries; the NOCO HM485 is specified for two of that larger size.

Choose the HM426 for two 6V GC2 batteries in a travel trailer, camper, boat, or solar bank. Its GC2-specific interior and stated outside dimensions make battery measurement and tongue-space planning important before installation.

Listed on Amazon as: NOCO HM426 Dual 6V GC2 Commercial-Grade Battery Box

#6

6. NOCO HM485

• Weight: 16.4 lb

Best for: Dual Group 8D Battery Banks.

Why it ranks #6: Designed for two Group 8D batteries, with inside dimensions of 21 by 23 by 10.6 inches for buyers needing a large bank enclosure.

Room for two Group 8D batteries side by side makes the NOCO HM485 a specialist option for large trailer and RV battery banks. Its 21.0-by-23.0-by-10.6-inch interior is specified for that battery class, helping buyers assess whether a substantial paired setup fits their available storage area.

The HM485 accommodates two 8D automotive, marine, RV, or commercial batteries in one enclosure, making it relevant to large house banks and listed uses such as heavy equipment or off-grid backup. Its rotationally molded engineered-polymer shell is described as commercial-grade and impact resistant, which supports choosing it for demanding applications. The internal measurements establish the battery space, while the 26.4-by-24.4-by-12.5-inch external dimensions help assess the larger footprint required for installation.

Skip it if you have two 6V GC2 batteries and need a smaller specified enclosure; the NOCO HM426 is sized for that pair.

The HM485 fits buyers carrying two Group 8D batteries in a trailer, RV, boat, or commercial setup. Its large external footprint is the key boundary: measure the intended tongue or storage area before planning installation.

Listed on Amazon as: NOCO HM485 Dual Group 8D Commercial-Grade Battery Box

#7

7. Peastorm Group 27 Box

• Size: 27 series (black)
• Weight: 4.79 kg

Best for: Group 27 Single-Battery Relocation.

Why it ranks #7: This steel relocation box is sized for one Group 27 battery, so it does not meet the dual-battery requirement despite trailer suitability.

A Group 27-specific format and published 14.9-by-9.45-by-11.2-inch dimensions set this peastorm box apart from the dual-battery options. It is listed for a Group 27 battery, so trailer owners seeking one battery enclosure can use the measurements to evaluate the intended mounting area.

The steel enclosure has a sprayed black coating and is described as waterproof, sunscreen, and fireproof for its listed car, marine, RV, and trailer applications. Handles on both sides support handling, while the lockable upper cover includes a lock. Multiple reserved holes have rubber-ring protection, and bottom fixing holes come with screws for attachment. Its published dimensions are useful for a space check, but its Group 27 designation makes it a single-battery rather than dual-battery solution.

Skip it if you need one enclosure for two batteries; the Camco Double Battery Box holds two GC2 or Group 24/24M batteries.

Pick this peastorm for a single Group 27 battery when its steel construction, lockable cover, and stated dimensions suit the trailer installation. It is not the right format for buyers who need a shared dual-battery box.

Listed on Amazon as: Peastorm Trailer RV Marine Battery Box – 12V Waterproof Steel Battery Relocation Kit for Boat, Trolling Motor, Kayak (Group 27 Black)