Drop-in Group 31 battery replacement—measuring 13 x 6.77 x 8.5 inches (330 x 172 x 216 mm) of the standard Group 31 dimensions, easy to fit into a wide range of RVs battery compartments.

Apparently, by going with a Group 31 Optima, we did need room for a 21 3/16-inch-longer and 1 9/16-inch-taller battery, but the footprint is only 22 percent bigger. In return, this got us 30 ...

EnerSys has upgraded Odyssey Performance Series Group 31 batteries to 925 cold cranking amps (cca), up from an original rating of 800 cca. The Odyssey 31-925 battery is made with what’s known as Thin ...

SANTA FE SPRINGS, Calif., June 19, 2018 – Trojan Battery Co., LLC, the world’s leading manufacturer of deep-cycle batteries, today announced the addition of a Group 31 size battery to its ...

We've tested and reviewed products since 1936. Read CR's review of the NAPA The Legend BAT 7565 car battery to find out if it's worth it.