NOCO BT31 Heavy-Duty Group 31 Battery Tray The NOCO BT31 is a rugged storage solution form-fit to the bases of group 31 size 12-volt SLA batteries used in automotive, marine, lawn, recreational, and utility vehicle types. Measuring 14" by 8.4" and weighing in at just a half-pound, the BT31 Battery Tray can be conveniently mounted onboard a vehicle so you can carry a quick-access backup battery into the field for extended excursions. All batteries between the sizes of 6.3" x 12.7" and 7.3" x 13.7" are compatible, and a 42-inch tie-down strap is included for maximum security in transport. Rugged Beyond Belief The BT31 can be mounted on everything from a snowmobile to a tractor and will rise to the diverse, tough challenges those vehicles will face. NOCO's group 31 battery tray is resistant to heavy impacts in temperatures as low as -20° F, with additional proofing against ultraviolet wear, oil and gasoline spillage, and more. Made in the USA, the BT31 is perfect for specific applications including generator or lawn/garden equipment, boats, campers, motorhomes, and caravans.