Group 26R battery size

Same box, other group numbers

• Group 26: 8.19 x 6.81 x 7.76 in, different terminal layout (BCI figure 10, not 11).

Same box does not mean same battery: if the terminals are on the other side, the cables may not reach.

Close in size

Groups within 10 mm (0.4 in) on every side:

• Group 140R: 8.15 x 6.89 x 7.48 in, different terminal layout (BCI figure 24, not 11).

Before you buy a group 26R battery

• Read the group number on the label of the battery in your car, or in the owner's manual: it should say 26R.
• The "R" means the terminals are reversed compared with the same number without R: the positive post is on the other side.
• Choose cold cranking amps (CCA) at least as high as the original, especially for cold winters.
• Measure your battery tray and the room above it, then compare with the size printed for the exact battery you pick, not only with the group number.
• Group 26R has top posts: the new battery must match, and the hold-down must fit the box.
• Most stores take the old battery back for recycling, often against a core charge.

Good to know about group 26R

• Retailers' specifications list the positive terminal of a group 26 battery on the left and of a 26R on the right: the R version has its terminals reversed.^1,2,3,4,5
• Listings for group 26R do not agree on length: NAPA and Batteries Plus list 8.75 in, longer than the 8.19 in BCI figure, while Continental lists 8.19 in and Interstate 8 in.^4,6,7,8

How we checked this page

Checked on October 16, 2026. We kept a fact only when two independent sources agree, and each one is numbered to its sources below. We never write a price: the listings come straight from eBay and show what sellers ask. This page was written with an AI assistant and checked against the sources below.