Buying Guide
4 Best RV Battery Box For Lithium Batteries in 2026: A Practical RV Guide
Four Group 24 to 31 battery boxes that hold LiFePO4 batteries in RVs, compared on interior size, ventilation, hold-down straps and price.
By Hardcastle's RV Editors
10 min read4 products evaluated
Lithium batteries do not gas, so the vented battery box you see on old lead-acid rigs is not strictly needed. A box still protects terminals, keeps the battery from sliding, and stops a loose wrench from shorting the posts. The key is internal size: many LiFePO4 batteries are Group 24, 27 or 31, and a box that is too tight will crush cables. These four boxes cover those sizes at different prices.
Hardcastle’s RV field notes
The Rig Fit Check
A quick way to connect the shortlist to the space, workload and ownership details that matter after the box arrives.
- Start with the job
- NOCO Snap-Top BG31 Battery Box leads this shortlist for buyers comparing capacity, compatibility, included components and storage needs. Use that fit as a reference point, then compare the alternatives against your own space and workload.
- Specs that separate the picks
- The first details to compare are Group 24 to 31 fit, 13.1 x 7 x 11 in, Group 29 and 31 fit. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Not rated for water immersion or heavy splashing
The Practical Shortlist
A road-tested-thinking look at 4 options, organized around the job each one suits best.
Best Overall
NOCO Snap-Top BG31 Battery Box
buyers comparing capacity, compatibility, included components and storage needs
Our take Check price for NOCO Snap-Top BG31 Battery Box (opens in a new tab)
Best for Wet Locations
attwood PowerGuard Pro
Wet bumper or bay mounting
Our take Check price for attwood PowerGuard Pro (opens in a new tab)
Best for Group 31
Attwood 9084-1 Large Vented Battery Box with Mounting Strap
Group 31 lithium batteries
Our take Check price for Attwood 9084-1 Large Vented Battery Box with Mounting Strap (opens in a new tab)
Best for Group 24
Camco Heavy Duty Group 24 Marine RV Battery Box with Strap
Group 24 drop-in lithium batteries
Our take Check price for Camco Heavy Duty Group 24 Marine RV Battery Box with Strap (opens in a new tab)
| Pick | Best for | Key spec | Price |
|---|---|---|---|
| buyers comparing capacity, compatibility, included components and storage needs | Group 24 to 31 fit | Check price for NOCO Snap-Top BG31 Battery Box (opens in a new tab) |
| Wet bumper or bay mounting | 13.1 x 7 x 11 in | Check price for attwood PowerGuard Pro (opens in a new tab) |
| Group 31 lithium batteries | Group 29 and 31 fit | Check price for Attwood 9084-1 Large Vented Battery Box with Mounting Strap (opens in a new tab) |
| Group 24 drop-in lithium batteries | Group 24 only | Check price for Camco Heavy Duty Group 24 Marine RV Battery Box with Strap (opens in a new tab) |
Why Each Pick Made the Cut
Best Overall1 of 4
NOCO Snap-Top BG31 Battery Box on Amazon (opens in a new tab)
NOCO Snap-Top BG31 Battery Box makes the shortlist because one box fits Group 24, 27 and 31 batteries.
Best for
- buyers comparing capacity, compatibility, included components and storage needs
Why it made the shortlist
This model is aimed at buyers comparing capacity, compatibility, included components and storage needs. The documented setup centers on group 24 to 31 fit, meets USCG 183.420, ABYC E-10.7, 48 in strap, divider included.
The most useful documented advantage is one box fits Group 24, 27 and 31 batteries. Its 48 in strap, divider included specification sits at the upper end of the comparable range in this 4-product comparison. Check that dimension against access points, working space and storage before choosing.
The main limitation to plan around is not rated for water immersion or heavy splashing. Measure the narrowest access point and the available storage footprint before ordering. Confirm what the stated dimension refers to on the exact model and configuration.
Key dimensions & specs
- Group 24 to 31 fit
- Meets USCG 183.420, ABYC E-10.7
- 48 in strap, divider included
Pros
- One box fits Group 24, 27 and 31 batteries
- Cheapest of the four at $20.38
- Strap, divider and mounting tray come in the box
Cons
- Not rated for water immersion or heavy splashing
- Optional vent holes need a call on your battery
Best for Wet Locations2 of 4
attwood PowerGuard Pro on Amazon (opens in a new tab)
The strongest case for attwood PowerGuard Pro is vents are designed to cut water intake.
Best for
- Wet bumper or bay mounting
Why it made the shortlist
For Wet bumper or bay mounting, this is one of the more relevant configurations in the shortlist. The documented setup centers on 13.1 x 7 x 11 in, upward vents, folding panels, impact-tested -20°F to 120°F.
Its case starts with vents are designed to cut water intake. Its 13.1 x 7 x 11 in specification sits at between the lower and upper ends of the comparable range in this 4-product comparison. Check that dimension against access points, working space and storage before choosing.
The trade-off worth checking first is costs $50.49, the most of the four. Measure the narrowest access point and the available storage footprint before ordering. Confirm what the stated dimension refers to on the exact model and configuration.
Key dimensions & specs
- 13.1 x 7 x 11 in
- Upward vents, folding panels
- Impact-tested -20°F to 120°F
Pros
- Vents are designed to cut water intake
- Folding panels reach terminals without removing the strap
- Spacer blocks adapt to three group sizes
Cons
- Costs $50.49, the most of the four
- Holds batteries only up to 9.3 inches tall
Best for Group 313 of 4
Attwood 9084-1 Large Vented Battery Box with Mounting Strap on Amazon (opens in a new tab)
Attwood 9084-1 Large Vented Battery Box with Mounting Strap is the better fit when group 31 lithium batteries.
Best for
- Group 31 lithium batteries
Why it made the shortlist
The intended use case is Group 31 lithium batteries. The documented setup centers on group 29 and 31 fit, 15-7/16 x 6-15/16 x 9-3/4 in, 350 lb rated strap.
What separates it on paper is roomy interior fits Group 31 lithium batteries. Its 15-7/16 x 6-15/16 x 9-3/4 in specification sits at the lower end of the comparable range in this 4-product comparison. Check that dimension against access points, working space and storage before choosing.
Before committing, account for no spacer for smaller Group 24 batteries. Measure the narrowest access point and the available storage footprint before ordering. Confirm what the stated dimension refers to on the exact model and configuration.
Key dimensions & specs
- Group 29 and 31 fit
- 15-7/16 x 6-15/16 x 9-3/4 in
- 350 lb rated strap
Pros
- Roomy interior fits Group 31 lithium batteries
- Strap is rated for 350 lbs of force
- Acid-resistant polypropylene is impact-tested down to -20°F
Cons
- No spacer for smaller Group 24 batteries
- Vented design lets some water in
Best for Group 244 of 4
Camco Heavy Duty Group 24 Marine RV Battery Box with Strap on Amazon (opens in a new tab)
Choose Camco Heavy Duty Group 24 Marine RV Battery Box with Strap for lift-off lid gives easy terminal access.
Best for
- Group 24 drop-in lithium batteries
Why it made the shortlist
Camco Heavy Duty Group 24 Marine RV Battery Box with Strap is positioned for Group 24 drop-in lithium batteries. The documented setup centers on group 24 only, 7-1/4 x 10-3/4 x 8 in, lift-off lid, woven strap.
The feature doing most of the work here is lift-off lid gives easy terminal access. Its 7-1/4 x 10-3/4 x 8 in specification sits at between the lower and upper ends of the comparable range in this 4-product comparison. Check that dimension against access points, working space and storage before choosing.
The practical constraint here is fits Group 24 only, no spacers. Measure the narrowest access point and the available storage footprint before ordering. Confirm what the stated dimension refers to on the exact model and configuration.
Key dimensions & specs
- Group 24 only
- 7-1/4 x 10-3/4 x 8 in
- Lift-off lid, woven strap
Pros
- Lift-off lid gives easy terminal access
- 2 inches of headroom for terminal hardware
- Stainless screws and foot clamps included
Cons
- Fits Group 24 only, no spacers
How We Built This Shortlist
Each pick was assessed across 4 criteria weighted for real-world use.
- Interior fit
- We compared listed interior dimensions to Group 24, 27 and 31 batteries.
- Ventilation and water
- We checked vent design and weather protection claims.
- Hold-down and standards
- We looked at strap rating and USCG or ABYC compliance.
- Price
- We weighed cost against included hardware.
What Matters Before You Choose an RV Battery Box For Lithium Batteries
Key buying criteria so you get the right fit the first time.
Interior dimensions versus battery
A Group 31 battery is about 13 x 6.77 x 8.5 inches. If the box interior is shorter, cables bind and terminals touch. Measure the battery and add 0.5 inch.
Terminal headroom
Lithium terminals need cable clearance. The Camco Group 24 lists 2 inches of headroom. Check the listing for lid clearance.
Hold-down strap strength
A loose battery is dangerous in a crash. The Attwood 9084-1 lists a 350 lb rated strap. Look for a rating, not just strap included.
Water and ventilation design
Lithium does not gas, but wet bays corrode lugs. The Attwood PowerGuard has upward vents. Check whether vents face up.
Standards and cold impact
Boxes that cite USCG 183.420 and ABYC E-10.7 meet marine hold-down rules. The NOCO BG31 and Camco Group 24 list both. This is not a lithium certification, so confirm separately.
Match an RV Battery Box For Lithium Batteries to Your RV
By Battery Group Size
| Your situation | Recommended pick | Why |
|---|---|---|
| Group 24 drop-in | Camco Group 24 | Sized for Group 24 with 2 inches of terminal headroom. |
| Group 31, 100Ah | Attwood 9084-1 | Interior is built for Group 29 and 31. |
| Unsure or mixed sizes | NOCO BG31 | Fits Group 24 to 31 with a divider. |
| Group 24, 27 or 31 in a wet spot | Attwood PowerGuard | Spacer blocks plus vents that reduce water entry. |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| $20 to $30 | NOCO BG31 or Attwood 9084-1 |
| $20 to $60 | Camco Group 24 or Attwood PowerGuard |
Vented vs Plain Mindset
- Vented boxes
- Attwood 9084-1 and Attwood PowerGuard release gas, meant for lead-acid, harmless for lithium.
- Plain boxes
- NOCO BG31 and Camco Group 24 offer optional or no venting and focus on protection.
Lithium does not need venting, so default to fit and strap strength.
By Budget
| Recommended | Recommended pick |
|---|---|
| Under $22 | NOCO BG31 |
| $22 to $26, specific group | Attwood 9084-1 |
| Over $50, wet mounting | Attwood PowerGuard |
For Bay-Mounted Lithium Installs Specifically
- Look for
- Interior dimensions at least 0.5 inch larger than your battery plus terminal headroom.
- In this comparison
- The Camco Group 24 provides 8 inches height plus 2 inches headroom, while the Attwood 9084-1 handles 9-3/4 inch tall batteries.
When to Spend More
- Spend more if
- if the box sits where water hits it, the $50.49 Attwood PowerGuard has the best vent design.
- Save if
- if the battery lives inside a dry compartment, the $20.38 NOCO BG31 is enough.
Before You Bring One Home
Does a lithium battery need a vented box?
LiFePO4 does not release hydrogen in normal use. Follow your battery maker's guidance.
Which box fits a Group 31 lithium battery?
The Attwood 9084-1 and NOCO BG31 fit Group 31. The Camco Group 24 does not.
Are these boxes fireproof?
No. None of these listings claim fire resistance.
Can I mount the box inside the RV?
Check your battery maker's instructions and RV rules. These listings target marine and RV use.
Bottom Line
Best overall: NOCO Snap-Top BG31 Battery Box — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all rv battery box for lithium batteries on Amazon — Prime-eligible options with current pricing.