Holds two Group 24 batteries side-by-side. Vented to expel hazardous gases — meets U.S. Coast Guard CFR 183.420 and ABYC E-10.7 specs. Lockable lid. Positive and negative terminals with 3/8" studs. Compatible with 3/8" ring terminals. Durable polymer construction, black. 17-5/8" × 15-1/2" × 13-7/8" (with vent ports). All hardware included. 1-year warranty.
The Camco 55370 is a purpose-built double battery box that holds two Group 24 batteries side-by-side in a single enclosure — protecting them from physical damage and keeping them safely contained in an RV storage compartment, truck bed, or marine application. Unlike open battery trays or makeshift mounting solutions, the 55370 fully encloses both batteries, shields the terminals from accidental contact, and provides a lockable lid that prevents unauthorized access or movement in transit.
The vented design is what makes this box suitable for enclosed storage. Lead-acid batteries — including conventional flooded, AGM, and gel types — can off-gas hydrogen during charging, which is explosive in confined spaces. The 55370's ventilation system, including the included hose, hose mount plate, louvered vent grille, and hose clamps, routes those gases safely out of the storage compartment. The box meets both U.S. Coast Guard CFR 183.420 and ABYC E-10.7 marine safety specifications — the same standards required for battery enclosures on boats, which are among the most stringent ventilation requirements for battery storage.
Side-by-side dual battery storage in one enclosure — fits two Group 24 batteries, the most common RV and marine starting and auxiliary battery size
Ventilation system routes battery off-gases safely out of enclosed storage compartments — meets U.S. Coast Guard CFR 183.420 and ABYC E-10.7 marine battery specifications
Lid locks to prevent unauthorized access, accidental opening, and battery movement during travel — keeps batteries securely contained in the enclosure
Positive and negative terminals with 3/8" studs allow external cable connections through the box — compatible with 3/8" ring terminals on standard battery cables
The 55370 is sized for Group 24 batteries. Despite the listing title mentioning Group 27, all confirmed specifications and Camco's own documentation describe this box as holding two Group 24 batteries. Group 27 batteries are physically longer (approximately 12" vs. 10.25" for Group 24) and will not fit in this enclosure. Group 24 approximate dimensions: 10.25" L × 6.75" W × 8.75" H (dimensions vary slightly by manufacturer) Not compatible with: Group 27, Group 31, 6V GC-2 golf cart batteries, or lithium batteries that exceed Group 24 dimensions. If you need a box for larger batteries, see Camco's Group 27 or Group 31 battery box options. Note on lithium batteries: Lithium (LiFePO4) batteries do not off-gas during normal operation and do not require vented enclosures. This box is primarily designed for lead-acid battery types (flooded, AGM, gel). It can physically house lithium batteries of Group 24 dimensions, but the venting hardware is unnecessary for lithium.
Many RV owners store batteries in closed compartments — under a bench seat, in a front storage bay, or inside a tongue box on a trailer. These enclosed spaces can accumulate hydrogen gas off-gassed by lead-acid batteries during charging, particularly at high charge rates or when batteries are overcharged. The hazard: Hydrogen gas is highly flammable and can ignite from a small spark — including the spark produced when connecting or disconnecting a battery cable. In a confined compartment with no ventilation, even a brief charging session can build up dangerous concentrations. What the 55370's ventilation system does: The included hose connects to the vent port on the battery box and runs to the outside of the RV or storage compartment. The louvered vent grille covers the exterior end of the hose. As gases accumulate inside the sealed box, they travel through the hose and vent safely to the outside air — keeping the compartment itself free of flammable gas. U.S. Coast Guard CFR 183.420 and ABYC E-10.7: These are the federal and industry standards for battery compartment ventilation in marine applications — among the most rigorous standards for enclosed battery storage. Meeting these specs means the 55370's ventilation design has been validated against real safety requirements, not just general best practices.
Tools Needed: Drill (for vent hose routing hole if needed), screwdriver, wrench for terminal connections Key Installation Steps: 1. Choose the mounting location — the battery box must be mounted where the vent hose can be routed to the outside of the RV or compartment 2. Secure the box to the floor or compartment surface using the included mounting hardware — prevents the box from shifting during travel 3. Route the vent hose from the box's vent port to the exterior — drill a hole if needed; seal around the hose with the included foam tape and putty tape to prevent moisture intrusion 4. Mount the louvered vent grille on the exterior end of the hose with the hose mount plate and hose clamps 5. Place both batteries in the box side-by-side 6. Connect battery cables through the terminal studs (3/8" ring terminals) — positive and negative terminals route external wiring through the box without exposing connections 7. Close and lock the lid Vent hose routing: The vent hose should terminate at a location where exhaust gases cannot re-enter the RV interior — not under a door, near a window, or next to an air intake.
Included in box: • (1) Battery box with lockable lid • (2) Battery terminals (positive and negative, 3/8" studs) • (1) Vent hose • (1) Hose mount plate • (1) Louvered vent grille • Foam tape • Putty tape • (2) Hose clamps • Mounting hardware NOT Included: • Batteries • Padlock (box is lock-ready — bring your own padlock)
Camco Customer Support: Phone: 1-800-334-2004 Website: camco.net Warranty: Camco warrants the 55370 against defects in material and workmanship for 1 year from the date of purchase by the original purchaser. Warranty does not cover misuse, mishandling, neglect, improper installation, or alteration. Proof of purchase required. California Prop 65: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. See P65Warnings.ca.gov.
If you need to store two batteries in an enclosed RV compartment where gases cannot safely accumulate, the 55370's Coast Guard-certified ventilation system is the key feature to look for. For open or well-ventilated mounting locations, a non-vented strap-style box like the 55374 may be sufficient.