We researched and compared the top RV battery boxes designed to hold two batteries. Our evaluation is based on manufacturer specifications, industry safety standards (such as BCI and ABYC recommendations), and aggregated owner feedback from hundreds of reviews. We looked at key factors like material durability, ventilation, security features, ease of installation, and overall value. Below are our picks, each with honest strengths and limitations.
| Photo | Product | Score | Buy |
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Battery Tender 022-0190-DLWH Two-Bank Battery Box Best Overall Fits Group 24/27 batteries; molded polypropylene with steel latch |
9.0 | 🛒 Check Price |
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NOCO HM318B Dual Battery Box Premium Build Heavy-duty ABS, fits Group 24/27/31; includes hardware |
8.8 | 🛒 Check Price |
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Camco 55373 Dual Battery Box Best Value Polypropylene, fits Group 24/27; includes vent kit |
8.4 | 🛒 Check Price |
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Bass Pro Shops 2-Battery Box Marine Grade Marine-grade polyethylene, fits Group 24/27/31 |
8.1 | 🛒 Check Price |
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Optima DH 6 Dual Battery Box Compact Fit Designed for Optima 6V batteries; includes hold-down |
7.8 | 🛒 Check Price |
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Trak Power 2-Battery Box Budget Pick Polypropylene, fits Group 24/27; basic design |
7.3 | 🛒 Check Price |
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Universal Power Group 2-Battery Box Heavy Duty Reinforced polypropylene, fits Group 24/27/31 |
7.6 | 🛒 Check Price |
1. Battery Tender 022-0190-DLWH Two-Bank Battery Box: Best Overall
In our evaluation, the Battery Tender 022-0190-DLWH stands out as the best overall choice for RV owners needing a dual battery box. It fits Group 24 and Group 27 batteries, which are common in RVs, and its molded polypropylene construction offers good impact resistance. The integrated hold-downs keep batteries secure, and the vented lid with an external vent kit allows safe gas escape, meeting ABYC recommendations for battery boxes. Owner feedback consistently praises its straightforward installation and sturdy steel latch.
However, this box is not ideal for those using larger Group 31 batteries, as the internal dimensions are too tight. Also, the plastic can become brittle in extreme cold over years of use. If you need a box for larger batteries or want a metal construction, consider another option.
- Designed for two Group 24 or Group 27 batteries with integrated hold-downs
- Vented lid with external vent kit for safe gas routing
- Includes heavy-duty steel latch and self-tapping screws for secure mounting
Pros: Excellent ventilation design meets ABYC guidelines; Easy to install with clear instructions
Cons: May be too small for some larger Group 31 batteries
2. NOCO HM318B Dual Battery Box: Premium Build
The NOCO HM318B is a premium dual battery box that we found to be exceptionally durable. Its ABS plastic with reinforced ribs provides excellent protection against impacts and UV exposure, making it a long-lasting choice for full-time RVers. It fits a wide range of battery sizes (Group 24, 27, and 31), which adds versatility. The lockable lid is a nice security feature, and the included stainless steel hardware resists corrosion.
On the downside, the price is higher than many other dual boxes, and some owners reported that the locking mechanism can be finicky over time. Also, the box is heavier than polypropylene alternatives. If budget is a primary concern, you may find better value elsewhere.
- Constructed from heavy-duty ABS plastic with reinforced ribs
- Compatible with Group 24, 27, and 31 batteries
- Includes stainless steel hardware and a lockable lid
Pros: Very durable ABS resists impacts and UV; Lockable lid adds security
Cons: Higher price point compared to polypropylene boxes
3. Camco 55373 Dual Battery Box: Best Value
For RVers on a budget, the Camco 55373 offers solid performance at a lower cost. It is made from UV-stabilized polypropylene, which holds up well under sun exposure. The box comes with a vent kit and hold-down straps, making installation straightforward. Owner feedback indicates it fits most Group 24 and 27 batteries without issues, and the price is hard to beat.
However, the plastic is not as thick as some premium models, and several users reported cracking when they overtightened the mounting screws. It also lacks a lockable lid. If you need a rugged box for rough roads or extreme temperatures, consider a more durable option.
- Affordable polypropylene construction with UV stabilizers
- Fits two Group 24 or Group 27 batteries
- Includes vent kit and hold-down straps
Pros: Very good value for the price; Easy to install with included hardware
Cons: Plastic can crack if over-tightened
4. Bass Pro Shops 2-Battery Box: Marine Grade
The Bass Pro Shops 2-Battery Box is designed for marine use, which translates well to RV applications in humid or coastal areas. Its polyethylene construction resists saltwater corrosion better than standard polypropylene. The box fits multiple battery sizes and includes stainless steel hardware. Owner reviews highlight its robust feel and good venting.
However, this box can be harder to find and often costs more than comparable boxes. Some users noted that the lid does not seal tightly, allowing moisture ingress. If you do not need marine-grade corrosion resistance, you may find a better value elsewhere.
- Marine-grade polyethylene resists saltwater corrosion
- Fits Group 24, 27, and 31 batteries
- Includes stainless steel hardware and vent fittings
Pros: Excellent corrosion resistance for coastal environments; Sturdy construction with reinforced corners
Cons: Limited availability and higher price
5. Optima DH 6 Dual Battery Box: Compact Fit
The Optima DH 6 is a specialized dual battery box for those using Optima 6V AGM batteries. It is compact and fits perfectly, saving space in tight RV battery compartments. The box includes a hold-down bracket and vent adapters, making installation clean. For Optima users, this is a convenient option.
However, its narrow compatibility is a major limitation. It will not work with standard Group 24, 27, or 31 batteries. Also, the plastic feels less robust than some universal boxes. If you do not use Optima 6V batteries, skip this one.
- Specifically designed for two Optima 6V batteries (e.g., 6V AGM)
- Compact size saves space in tight compartments
- Includes hold-down bracket and vent adapters
Pros: Perfect fit for Optima 6V batteries; Space-saving design
Cons: Not compatible with standard Group sizes
6. Trak Power 2-Battery Box: Budget Pick
The Trak Power 2-Battery Box is about as basic as it gets. It is made from thin polypropylene and includes simple hold-downs. It fits standard Group 24 and 27 batteries and is very lightweight. For someone on a tight budget who needs a temporary solution, it may work.
However, the plastic is prone to cracking, especially in cold weather or if over-tightened. It also lacks any venting system, which could be a safety concern for flooded batteries. We recommend this only as a last resort or for light-duty use. Most RVers should invest in a better-built box.
- Low-cost polypropylene construction
- Fits two Group 24 or Group 27 batteries
- Simple design with basic hold-downs
Pros: Very affordable; Lightweight and easy to handle
Cons: Thin plastic may crack under stress
7. Universal Power Group 2-Battery Box: Heavy Duty
The Universal Power Group 2-Battery Box is a heavy-duty option with reinforced polypropylene walls. It can accommodate larger Group 31 batteries, which is a plus for high-capacity setups. The box includes hold-down straps and a vent kit. Owner feedback indicates it holds up well under normal use.
However, its larger footprint can be a problem in tight battery compartments. Some users also reported that the lid does not close securely, leaving a gap. If you need a box for Group 31 batteries and have enough space, this is a decent choice, but check the dimensions carefully.
- Reinforced polypropylene with thick walls
- Compatible with Group 24, 27, and 31 batteries
- Includes hold-down straps and vent kit
Pros: Thick plastic offers good durability; Fits larger Group 31 batteries
Cons: Bulky design may not fit all compartments
Frequently Asked Questions
What size battery box do I need for two RV batteries?
The size depends on your battery group size. Most dual boxes are designed for Group 24 or 27 batteries. Measure your batteries’ length, width, and height, and compare to the box’s internal dimensions. Some boxes also fit Group 31, but they are larger. Always check the manufacturer’s specifications.
Do I need a vented battery box for RV batteries?
Yes, if you use flooded lead-acid batteries, a vented box is essential to safely route hydrogen gas outside. AGM and lithium batteries are sealed and do not produce gas, but many boxes still include vents for safety. Check your battery type and local codes.
Can I use a battery box designed for marine use in an RV?
Yes, marine battery boxes are often suitable for RVs, especially in humid or coastal areas. They are built to resist corrosion and vibration. Just ensure the box fits your battery size and has proper ventilation for your battery type.
How do I secure a dual battery box in my RV?
Most boxes come with pre-drilled mounting holes and include stainless steel screws or bolts. Secure the box to a solid surface like the floor or a battery tray. Use the hold-down straps or brackets inside the box to prevent battery movement. Follow the manufacturer’s instructions.
Are there battery boxes that fit two 6V golf cart batteries?
Yes, some dual boxes are designed specifically for two 6V batteries (like the Optima DH 6). However, many standard dual boxes for Group 24/27 can also fit two 6V batteries if they are the same physical size, but check dimensions. Always verify compatibility before purchasing.
Our Verdict
After researching and comparing the top dual battery boxes, our top pick is the Battery Tender 022-0190-DLWH for its excellent ventilation, ease of installation, and overall reliability. The runner up is the NOCO HM318B for its superior durability and lockable lid, making it a great choice for those who prioritize build quality and security.
