The NOCO BG31 Snap-Top Battery Box is a rugged battery storage solution for a single Group 24, 27, or 31 automotive, marine, or RV battery. The snap-top design uses locking tabs to secure the cover to the case, while full ventilation helps release battery gases safely during use and charging.

Built from impact-resistant plastic with reinforced handles, this black matte battery box maintains its properties down to -20°F and resists UV, oil, gas, and other contaminants. It meets Coast Guard CFR 183.420 and ABYC E-10.7 requirements for marine battery installations.

Features & Benefits

• Designed for a single Group 24 to Group 31 battery
• Snap-top cover with locking tabs for secure fastening
• Adjustable divider to accommodate various battery sizes
• Fully ventilated to release battery gases safely
• Reinforced plastic handles help prevent cracking during relocation
• Impact resistant down to -20°F
• UV, oil, gas, and contaminant resistant
• Meets Coast Guard Code of Federal Regulations 183.420
• Meets American Boat and Yacht Council E-10.7
• Includes 42 inch battery box strap
• Limited 1-year warranty

Specifications

Brand	NOCO
Manufacturer Part #	BG31
Model	HM318BKS Snap-Top
Type	Snap-Top Battery Box
Battery Quantity	1
Compatibility	Group 24, 27, and 31 Batteries
Inside Dimensions	14 Inch L x 7-1/8 Inch W x 9-5/8 Inch H
External Dimensions	17-5/8 Inch L x 10 Inch W x 10-3/4 Inch H
Color	Black
Material	Plastic
Finish	Matte
Vented	Yes
Includes Cable	No
Includes Hold-Down	No
Included Strap	42 Inch Battery Box Strap
Weight	3.29 lb
Marine Rated	Yes
Certifications	Coast Guard CFR 183.420, ABYC E-10.7
Warranty	Limited 1-Year

Compatibility

Fits Group 24, 27, and 31 automotive, marine, and RV batteries. Suitable for installation in cars, boats, campers, motorhomes, trailers, caravans, and generator equipment.

Recommended Items

Commonly ordered battery box straps and accessories:

Battery Box Straps

Part #	Description	Notes
17544	Battery box strap; use to secure any battery or battery box; 54 inch length; black; with chrome plated hardware	JR Products — universal fit
BS48	Battery box strap; for use with BG series battery boxes; black; woven polypropylene; 48 inch length; with stainless steel hardware	NOCO — designed for BG series boxes
BS48R	Battery box strap; for use with BG series battery boxes; black; woven polypropylene; 48 inch length; with stainless steel hardware	NOCO — designed for BG series boxes
13339	Battery box strap; strap for battery box; black; polypropylene; 42 inch strap	Arcon
12024	Battery box strap; strap for battery box; black; polypropylene; 42 inch strap	Arcon

Search by part number on RV & Auto Parts to order compatible battery box straps and accessories.

NOCO BG31 — Frequently Asked Questions

What batteries does the NOCO BG31 fit?

It is designed for a single Group 24, Group 27, or Group 31 automotive, marine, or RV battery. An adjustable divider helps accommodate various battery sizes within that range.

What are the inside and outside dimensions?

Inside dimensions are 14 inches long by 7-1/8 inches wide by 9-5/8 inches high. External dimensions are 17-5/8 inches long by 10 inches wide by 10-3/4 inches high.

Is the NOCO BG31 vented?

Yes. It is fully ventilated to help release battery gases safely during use and charging.

Is this battery box Coast Guard and ABYC certified?

Yes. It meets Coast Guard Code of Federal Regulations 183.420 and American Boat and Yacht Council E-10.7 requirements.

What is included with the NOCO BG31?

It includes a 42 inch battery box strap. It does not include a cable or hold-down.

Which replacement straps fit the BG31?

Compatible straps include NOCO BS48 and BS48R for BG series battery boxes, as well as JR Products 17544, Arcon 13339, and Arcon 12024. Verify fitment before ordering.

Is the NOCO BG31 suitable for marine use?

Yes. It is marine rated and designed for boat, RV, camper, and trailer battery installations.