9 Best Dual Battery Boxes for RVs (November 2026)

The best dual battery boxes for RVs include the Attwood 9067-1 Vented Battery Box with Mounting for Group 27 RV batteries, the Camco Double Battery Box for most RV battery pairs, and the GEARMEISTER Trolling Motor Power Center Station Battery for built-in power ports.

On this page (7 sections)

1. Which dual battery box is best for an RV?
2. Best dual battery boxes for RVs
3. How do you choose a dual battery box for an RV?
4. Should you use a vented or non-vented RV battery box?
5. What else should you check before installing a dual battery box?
6. Which dual battery box should you buy?
7. Add theft deterrence only if your parking habits call for it. A locking bracket can help with a compatible single box, but it does not replace the enclosure itself.

The best dual battery box for RV use is the Camco Double Battery Box for two 6V GC2 or two 12V Group 24/24M batteries. Choose the NOCO HM426 for a pair of 6V GC2 batteries, the Peastorm for a steel dual-battery enclosure, or the GEARMEISTER when built-in power ports matter more than storing two batteries together.

A dual battery box keeps paired batteries in one enclosure, which can make better use of a narrow RV mounting area. The correct choice depends on your battery group, available clearance, ventilation needs and whether you need a simple enclosure or a built-in power center.

Start by checking the size written on your current batteries and the space you have to work with. That first check will rule out several options quickly and leave you with a shorter list that actually fits your RV.

If you need basic battery terms first, read what is a deep cycle battery. RV owners comparing the complete electrical system can also review our guide to the best rv house battery.

Our picks at a glance

1. 1
   Best for Group 27 RV batteries

   Attwood 9067-1 Vented Battery Box with Mounting

   9.7/10 our score

   See it on Amazon
2. 2
   Best for most RV battery pairs

   Camco Double Battery Box

   9.7/10 our score

   See it on Amazon
3. 3
   Best for built-in power ports

   GEARMEISTER Trolling Motor Power Center Station Battery

   9.6/10 our score

   See it on Amazon

4. 4

   Peastorm Trailer RV Marine Battery Box

   Best for steel dual-battery relocation
   Check it
5. 5

   Attwood 9069-1 Standard Non-Vented Battery Box

   Best for Group 24 enclosed compartments
   Check it
6. 6

   NOCO HM408 Group 4D Commercial-Grade Battery Box

   Best for one large 4D battery
   Check it
7. 7

   B&D RV Battery Lock RV Locking Battery Strap

   Best for theft deterrence
   Check it
8. 8

   ALL-TOP Smart Battery Box

   Best for DIY solar power centers
   Check it
9. 9

   NOCO HM426 Dual 6V GC2 Commercial-Grade Battery

   Best for protected GC2 series banks
   Check it

Which dual battery box is best for an RV?

The Camco Double Battery Box is the best starting point for most RV battery pairs. It holds two 6V GC2 or two 12V Group 24/24M batteries and includes two straps with four strap clamps and screws.

The NOCO HM426 is the more specialized choice for two 6V GC2 batteries wired in series for 12V. One option covers more battery types, while the other is shaped around a single pair.

We compared battery fit, interior size, enclosure design, ventilation, included mounting parts and the type of RV job each option supports. Battery group comes first because a box cannot do its job if the dimensions are wrong.

Measure each battery alone and then measure the pair together, since combined length is what the box must hold. Interior size is the space inside the walls, not the outside footprint.

You also need outside size for the RV compartment, because a box that fits the batteries can still be too large for the bay. Ventilation is the next filter, and the right answer depends on battery type and compartment.

Included parts change the real cost of a setup. A box with straps, clamps and screws needs less extra shopping than a box where mounting hardware is sold separately.

For a simple single-battery enclosure, our guide to the best battery box for rv covers more layouts. If you are choosing a larger lithium bank, compare these picks with the best 200ah lifepo4 rv battery guide.

Use this roundup to narrow the field, then confirm fit with your own measurements. Check straps and fasteners during routine maintenance, and keep the lid and ventilation paths clear.

Best dual battery boxes for RVs

The Camco is the strongest all-around dual enclosure, while the NOCO HM426 gives a more purpose-built fit for two GC2 batteries. The remaining picks cover Group 27 storage, steel relocation, large 4D batteries, theft deterrence and DIY power connections.

1

Attwood 9067-1 Vented Battery Box with Mounting: Best for Group 27 RV batteries

9.7/10Our score

• Fits Group 27 batteries
• Vented design
• 40 in hold-down strap
• 350 lb strap rating
• Acid-resistant polypropylene

The Attwood 9067-1 is a strong choice when your RV uses a Group 27 battery and the installation needs ventilation. Its included strap and mounting hardware simplify secure placement.

See it on Amazon

Pros

• Fits Group 27 batteries
• Vented cover
• Includes mounting strap and hardware

Cons

• Holds one battery
• Not a dual-battery enclosure

The Attwood 9067-1 is a single-battery box, but it earns a place here for RV owners who are building a dual-battery setup with two separate Group 27 enclosures. Its interior measures 13.06 x 6.9 x 10.5 in, and the box fits Group 27 batteries up to 10.5 in high.

The vented design allows battery gases to escape while the cover helps limit water entry. Acid-resistant polypropylene is impact-tested from -20°F to 120°F, and the included 40 in strap is rated for 350 lb of force.

The box includes mounting hardware, making it useful when your RV has two separate mounting locations instead of one long dual-box space. Check the spacing between boxes before routing cables between the batteries.

Choose it when your batteries are Group 27 and each battery needs its own vented enclosure. It is not the right pick if you specifically need both batteries inside one box.

2

Camco Double Battery Box: Best for most RV battery pairs

9.7/10Our score

• Holds two 6V GC2 batteries
• Holds two 12V Group 24/24M batteries
• Corrosion-resilient polymer
• Two straps
• Four strap clamps with screws

The Camco Double Battery Box is the most direct fit for an RV owner storing two common deep-cycle battery configurations in one enclosure.

See it on Amazon

Pros

• Designed for two batteries
• Two straps included
• Meets stated USCG and ABYC specifications for two 6V GC2 batteries

Cons

• Limited to listed battery sizes
• Large length needs careful mounting-space checks

The Camco Double Battery Box is the best dual battery box for most RV owners because it holds either two 6V Group GC2 batteries or two 12V Group 24/24M batteries. Its inner dimensions are 21.5 x 7.375 x 11.1875 in.

The corrosion-resilient polymer enclosure includes two straps and four strap clamps with screws, so the basic hold-down parts are included. Camco also states that it meets USCG CFR 183.420 and ABYC E-10.7 specifications when used with two 6V Group GC2 batteries.

The long interior makes this a practical choice where the RV has one shared battery bay. Measure the full outside footprint and check that the lid can open without hitting a wall, shelf or wiring.

Choose it for the widest battery-fit options in this roundup. Confirm the group size before ordering because the stated fit is limited to GC2 and Group 24/24M configurations.

For setup, place the batteries first and check the strap path before you fix anything in place. The straps should sit where they can be tightened without pinching cables or blocking access to the terminals.

Care is simple with this type of polymer enclosure, but it still needs checks over time. Wipe away dirt and corrosion around the edges, and look at the clamps and screws each season.

The trade-off is the long shape, which needs a clear run of mounting space. If your bay is short or split, a pair of single boxes may fit better than one long enclosure.

3

GEARMEISTER Trolling Motor Power Center Station Battery: Best for built-in power ports

9.6/10Our score

• Fits Group 24, 27 and 31 batteries
• USB-A QC 3.0 port
• USB-C PD port
• 12V cigarette socket
• Two 50A Anderson plugs
• LED voltmeter

The GEARMEISTER turns a compatible 12V or 24V battery into a portable power center with charging ports and a digital voltage display. The battery is not included.

See it on Amazon

Pros

• Supports several Group sizes
• Multiple output ports
• Built-in voltmeter and circuit breaker

Cons

• Battery not included
• Not a two-battery enclosure

The GEARMEISTER is best when you want a battery box that also acts as a compact power center. It fits Group 24, 27 and 31 batteries, with an interior size of 13.3 x 7.6 x 8.8 in, and the battery is not included.

Its built-in ports include USB-A QC 3.0, USB-C PD, a 12V cigarette socket and two 50A Anderson plugs. An LED voltmeter shows battery status, while a 10A resettable circuit breaker adds protection for the connected ports.

This is a single-battery case, so it does not replace a dual enclosure when you need two batteries in one box. It can suit an RV owner who wants one compatible battery to power devices through several connection types.

Choose it for portable connections and battery monitoring. Check the battery dimensions carefully because Group 24, 27 and 31 labels do not remove the need for an actual fit check.

4

Peastorm Trailer RV Marine Battery Box: Best for steel dual-battery relocation

9.2/10Our score

• Steel construction
• Waterproof and sunscreen coating
• Lockable upper cover
• Reserved fixing holes
• Includes lock, screws and rubber rings

The Peastorm is made for a double-battery series setup where a steel enclosure and lockable cover fit the installation plan. Measure both the batteries and the mounting area first.

See it on Amazon

Pros

• Steel enclosure
• Lock included
• Mounting screws and rubber rings included

Cons

• Maximum internal size needs careful measurement
• The data does not identify a vented design

The Peastorm is the best steel option for a double battery series installation. Its maximum capacity size is 22 x 8.5 x 11.5 in, while the external size is 22.25 x 8.7 x 11.75 in.

The steel box has a black surface coating and a lockable upper cover. It includes one lock, four rubber rings and four screws, plus reserved fixing holes at the bottom.

That combination suits a trailer or RV where you want a single enclosure and a lockable cover. Handles on both sides make it easier to move during installation and battery checks.

Choose it when the dual-battery layout and steel enclosure match your installation. Measure both batteries before buying, especially if the pair is taller than the stated 11.5 in maximum height.

For setup, use the bottom fixing holes and included screws to fix the box to the surface. The rubber rings help protect reserved holes where cables pass through.

Keep the steel clean and dry where you can, and check that the lock and screws stay tight. The stated maximum is strict, so a pair even a little taller or wider will not sit properly inside.

5

Attwood 9069-1 Standard Non-Vented Battery Box: Best for Group 24 enclosed compartments

9.1/10Our score

• Fits Group 24 batteries
• Non-vented lid
• 40 in hold-down strap
• 350 lb strap rating
• Acid-resistant polypropylene

The Attwood 9069-1 fits a single Group 24 battery where a non-vented enclosure is suitable for the approved compartment. It includes the strap and mounting hardware.

See it on Amazon

Pros

• Fits Group 24 batteries
• Includes mounting hardware
• Protective non-vented lid

Cons

• Holds one battery
• Not suitable where ventilation is required

The Attwood 9069-1 suits a single Group 24 battery in an approved compartment where a non-vented box is appropriate. Its interior measures 10.6 x 7 x 10.125 in, and the enclosure includes a 40 in strap rated for 350 lb of force.

Acid-resistant polypropylene is impact-tested from -20°F to 120°F. The box also includes mounting hardware and a protective lid that shields terminals from moisture and debris.

Two of these boxes may work when your RV battery positions are separate. They are not a substitute for a shared dual battery box if the batteries must sit side by side in one enclosure.

Choose it for Group 24 batteries and a non-vented installation plan. If your compartment requires gas ventilation, select a vented design instead.

For setup, mount the box first and then secure the battery with the included strap. The strap should hold the battery firm without pressing on the terminals or cables.

The lid is the main protection here, since it covers the top from moisture and debris. That makes it a good match for a clean, approved compartment rather than an open mounting area.

Care means keeping the lid closed and checking the strap and hardware during routine maintenance. Look for cracks in the polypropylene after cold or rough travel days.

The trade-off is clear from the design, because non-vented means no planned gas path. If ventilation is part of your installation rules, this is not the box to pick.

6

NOCO HM408 Group 4D Commercial-Grade Battery Box: Best for one large 4D battery

8.9/10Our score

• Fits one Group 4D battery
• Full-flow ventilation
• Rotationally molded polymer
• Captive lid
• Four-corner fastening system

The NOCO HM408 is for a single large Group 4D battery used in an RV house bank or another demanding installation. Its footprint is much larger than standard single-battery boxes.

See it on Amazon

Pros

• Fits Group 4D batteries
• Full-flow ventilation
• Captive lid with fastening knobs

Cons

• Holds one battery
• Mounting hardware and hold-down strap sold separately

The NOCO HM408 is built for one large Group 4D battery, including batteries used in RV house banks. Its inside dimensions are 21.2 x 9.6 x 11.1 in, with outside dimensions of 24.7 x 13 x 14 in.

Full-flow ventilation lets charging gases escape, while the internal reservoir collects leaking acid. The rotationally molded engineered-polymer shell resists acid, gas and oil, and its impact strength is stated down to -20°F.

A captive lid, two lock-down knobs and four-corner bolt-down slots support a fixed installation. Large cable entry holes help with heavy-gauge cables, which are common on larger banks.

Mounting hardware and the hold-down strap are sold separately, so include those parts in your setup plan. Choose it when your RV uses one Group 4D battery rather than two smaller batteries.

Its larger footprint makes a careful clearance check essential. Care should include checking the knobs, bolts and ventilation path over time.

7

B&D RV Battery Lock RV Locking Battery Strap: Best for theft deterrence

8.5/10Our score

• Fits standard Group 24 and Group 27 boxes
• 3/16 in steel
• Powder-coated finish
• Tool-free installation
• Disc padlock required

The B&D RV Battery Lock adds a locking bracket around compatible single-battery boxes. It suits RV owners who need theft deterrence, but it is not a battery enclosure.

See it on Amazon

Pros

• Designed for standard Group 24 and Group 27 boxes
• Steel construction
• No tools needed for installation

Cons

• Not a battery box
• Requires your own disc-style padlock

The B&D RV Battery Lock is for theft deterrence, not battery storage. It fits standard Group 24 and Group 27 single-battery boxes and uses a 3/16 in steel bracket with a powder-coated finish.

Installation takes no tools, and the bracket measures 10.375 x 8.625 x 1.25 in. You must supply a disc-style padlock because the lock is not included.

This can help secure a compatible single box to the trailer tongue structure. It does not turn two single boxes into a dual battery box and does not replace the enclosure itself.

Choose it after selecting a compatible Group 24 or Group 27 box. Confirm the box size and mounting structure before relying on the bracket.

This suits trailer owners who park in campgrounds, storage yards or driveways where theft is a concern. The bracket is a focused add-on, not a full battery system by itself.

For setup, slide the bracket around the battery box and attach it to the trailer structure as directed. The tool-free design keeps it simple, but the padlock step is essential for the locking function.

Care is mostly about the steel finish and the padlock you choose. Keep the bracket clean, and check that it still sits tight after rough travel.

The trade-off is narrow fit, since it only suits standard Group 24 and Group 27 single boxes. Taller boxes and dual enclosures fall outside what this bracket is made for.

8

ALL-TOP Smart Battery Box: Best for DIY solar power centers

8.3/10Our score

• Fits 12V to 24V batteries
• Two 50A quick connectors
• Digital voltmeter
• Two USB ports
• 12V cigarette socket
• 16A resettable circuit breaker

The ALL-TOP is a DIY power center for RV, marine, camping and solar storage setups. It does not include a battery, and smaller batteries may not fit securely because there is no internal fixing frame.

See it on Amazon

Pros

• Multiple power ports
• Two fused 50A connectors
• Digital voltage display

Cons

• Battery not included
• Smaller batteries may not fit securely

The ALL-TOP is a DIY power center for RV, camping, marine and solar storage use. It works with 12V to 24V batteries that fit inside, including Group 24, 27 and 31 plus most AGM and lithium batteries.

Its ports include external positive and negative terminals, two 50A quick connectors, two USB ports and a 12V cigarette socket. Each quick connector has a 60A fuse, while the USB and cigarette ports use a 16A resettable circuit breaker, and a digital voltmeter shows battery status.

The case does not include a battery or an internal fixing frame. Smaller batteries may not fit securely, so compare actual battery size with the case before choosing it.

Choose it when you want a custom power station built around one battery. For a paired battery bank inside one enclosure, use a dual-battery model instead.

This suits owners who want one battery to run several devices through different ports. The external terminals also give a direct connection option for higher current gear.

For setup, connect the battery first and check the port layout before you plug anything in. Keep ports clean and the case closed when not in use, and check fuses and breaker during routine maintenance.

The trade-off is the missing internal fixing frame, which affects smaller batteries most. If your battery does not fill the case well, a simpler enclosure may be the safer choice.

9

NOCO HM426 Dual 6V GC2 Commercial-Grade Battery: Best for protected GC2 series banks

8.2/10Our score

• Fits two 6V GC2 batteries
• Full-flow ventilation
• Rotationally molded polymer
• Captive lid
• Four-corner fastening system

The NOCO HM426 keeps two 6V GC2 batteries together for a 12V series bank. It is a durable enclosure, but mounting hardware and the hold-down strap are sold separately.

See it on Amazon

Pros

• Built for two GC2 batteries
• Full-flow ventilation
• Captive lid

Cons

• Lower score for this roundup
• Mounting hardware and strap sold separately

The NOCO HM426 is the best specialized enclosure for two 6V GC2 batteries wired in series for 12V. Its inside dimensions are 14.6 x 10.5 x 11.5 in, and its outside dimensions are 17.9 x 14.3 x 14 in.

Full-flow ventilation lets charging gases escape, while the closed lid limits water entry and covers the terminals. The rotationally molded polymer shell resists acid, gas and oil, and the box is designed for RVs, campers, travel trailers, boats and off-grid solar setups.

Four-corner bolt-down slots and two lock-down knobs support a fixed installation. Mounting hardware, hold-down strap and batteries are sold separately.

Choose it when your pair is specifically two GC2 batteries and you want a captive lid. The Camco is more flexible if you may use two Group 24/24M batteries instead.

For setup, bolt the base down through the four-corner slots and secure the captive lid with the two knobs. Large cable entry holes give room for heavy-gauge cables.

Check bolts, knobs and ventilation path during routine maintenance, and look at the base now and then since the internal reservoir collects leaking acid. Plan the missing hardware and strap ahead of time, or installation will pause at the last step.

How do you choose a dual battery box for an RV?

Choose the box by battery group first, then compare inside dimensions with the actual batteries and outside dimensions with the RV compartment. A box that fits the batteries but blocks the lid, cables or mounting bolts is still the wrong size.

That order saves time because group size rules out more options than any other detail. A Group 24 battery and a Group 27 battery may look close, but height and length can differ enough to matter.

A two-battery enclosure is the simplest match for paired batteries in one bay. The Camco fits two GC2 or two Group 24/24M batteries, while the NOCO HM426 is sized specifically for two GC2 batteries.

Inside dimensions tell you if the batteries will fit, and outside dimensions tell you if the RV will fit the box. You need both numbers, since walls and lid take up space that battery measurements do not show.

For two separate Group 27 batteries, two Attwood 9067-1 boxes may work better if the RV has split mounting areas. The Peastorm is the most direct dual-battery choice when its steel construction, lockable cover and stated maximum size fit your plan.

Ventilation should be checked early, not after you have fixed the box in place. Vented and non-vented designs suit different compartments, and the wrong match is hard to fix later.

Mounting method is another early check, including straps, bolts and lock-down knobs. Some boxes include the hardware, while others need mounting parts bought apart, so read the included list before you order.

Cable routing deserves the same care as box size itself. Leave room for heavy cables to enter without sharp bends, and open the lid fully in the planned spot to check for shelves, walls and wiring that could block it.

For a single large battery, a different layout may fit better than a dual box. A Group 4D battery needs a larger enclosure, and forcing it into a smaller box will not work.

For portable power, a box with built-in ports may suit your job better than a plain enclosure. Check straps, bolts, cables and terminals during routine maintenance, and keep ventilation paths clear.

Should you use a vented or non-vented RV battery box?

Use a vented battery box when the battery and compartment require gas ventilation, and choose a non-vented box only where that design is suitable. The Attwood 9067-1, Camco, NOCO HM408 and NOCO HM426 have stated ventilation features.

The Attwood 9069-1 is non-vented and is intended for installations where ventilation is not required. Do not choose it only because its Group 24 size fits.

Ventilation is not a small detail, because the box and compartment work together. A vented lid needs a clear path for gases to leave, while a non-vented lid is meant for a setup where that path is not part of the plan.

Battery type also guides the decision, along with the RV manual and battery instructions. Those sources should come before any preference for a particular box shape or size.

For marine-style compliance references, the U.S. Coast Guard battery regulations are a useful starting point.

They help explain why hold-down and ventilation rules are taken seriously.

Your RV manual and battery instructions should guide the final installation. If those instructions call for ventilation, a non-vented box is the wrong match even when the battery fits.

Setup should keep the ventilation path clear from the start. Do not block vents with insulation, stored gear or cable bundles, and check the path during routine maintenance.

Tighten knobs and bolts as needed, and look for damage after rough travel. Match venting to the approved installation, and you will avoid a costly change later.

What else should you check before installing a dual battery box?

Check the battery chemistry, terminal layout, cable length, lid clearance and hold-down method before installation. A dual battery box protects the batteries only when the box itself is fixed and the cables can reach without strain.

If you are switching to AGM batteries, compare our best agm deep cycle battery for rv guide. If you are considering solar input, the Best Dual Solar Panel Setup guide can help you plan the charging side.

A portable power station may be simpler for occasional use, and our guide explains How to Power an RV with a Portable Power Station?. For larger batteries, compare the best battery box group 31 options before choosing a box by name alone.

Secure the enclosure to the approved mounting surface, keep the ventilation path clear when the box is vented, and inspect straps, clamps, cables and terminals during routine RV maintenance.

Which dual battery box should you buy?

Pick the Camco Double Battery Box if you need one enclosure for two GC2 or Group 24/24M batteries. Pick the NOCO HM426 for two 6V GC2 batteries with a captive lid and full-flow ventilation, or choose the Peastorm when a steel dual-battery relocation box with a lockable cover fits your measurements.

For separate Group 27 batteries, use two vented Attwood 9067-1 boxes. For a single large 4D battery, choose the NOCO HM408, and for built-in ports around one compatible battery, choose the GEARMEISTER or ALL-TOP.

Start with your battery group and take the measurements that matter most. Check battery length, width and height, then compare them with the inside size of the box.

Next, check outside size against your RV compartment. Leave room for the lid to open, for cables to route cleanly and for any bolts or straps that hold the box down.

Ventilation should be settled before you order, since it is tied to battery type and compartment. A vented box and a non-vented box are not interchangeable in every installation.

Included hardware is worth a final look as well. Some boxes come with straps and screws, while others need mounting parts bought apart, so plan for the full setup.

Add theft deterrence only if your parking habits call for it. A locking bracket can help with a compatible single box, but it does not replace the enclosure itself.

Our top 3 picks at a glance

1. 1
   Best for Group 27 RV batteries

   Attwood 9067-1 Vented Battery Box with Mounting

   9.7/10 our score

   See it on Amazon
2. 2
   Best for most RV battery pairs

   Camco Double Battery Box

   9.7/10 our score

   See it on Amazon
3. 3
   Best for built-in power ports

   GEARMEISTER Trolling Motor Power Center Station Battery

   9.6/10 our score

   See it on Amazon

Frequently asked questions

What is the best dual battery box for an RV?

The Camco Double Battery Box is the best dual battery box for most RV owners because it holds two 6V GC2 batteries or two 12V Group 24/24M batteries. The NOCO HM426 is a better match when your pair is specifically two 6V GC2 batteries and you want a captive lid with full-flow ventilation.

What is the difference between a dual battery box and two single boxes?

A dual battery box holds both batteries in one enclosure, which can simplify placement when your RV has limited mounting space. Two single boxes may be easier when the batteries sit in separate locations.

Match the box layout to the available length, width, height and cable-routing path.

Can a dual battery box hold two 12V batteries?

Yes, some dual battery boxes are designed for two 12V batteries. The Camco Double Battery Box holds two 12V Group 24/24M batteries, while the Peastorm is described for a double battery series setup.

Confirm the battery group size and interior measurements before ordering.

Should an RV battery box be vented?

Venting depends on the battery type, compartment and installation requirements. Vented options here include the Camco, NOCO HM426, NOCO HM408 and Attwood 9067-1.

The Attwood 9069-1 is non-vented, so use it only where that design is suitable.

What should I measure before buying an RV dual battery box?

Measure the battery pair, the box opening, mounting surface and available cable path. Compare those measurements with the box's inside and outside dimensions.

Also check lid clearance, strap or bolt locations and whether the enclosure's ventilation design fits the approved RV compartment.