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Car Tire Size / Car battery size / Group 26

Group 26 battery size

A group 26 car battery is at most 8.19 inches long, 6.81 wide and 7.76 tall (208 x 173 x 197 mm), with top posts.

Length
8.19 in (208 mm)
Width
6.81 in (173 mm)
Height
7.76 in (197 mm)
Terminals
top posts
Group 26, drawn to scale, in inches (the same scale on every group page)
Front8.19 in7.76 inTop8.19 in6.81 in

Same box, other group numbers

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

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 10).

Before you buy a group 26 battery

  • Read the group number on the label of the battery in your car, or in the owner's manual: it should say 26.
  • A group with an "R" after the number has its terminals reversed: do not swap one for the other without checking where your cables reach.
  • 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 26 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 26

  • 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
  • Group 26 is as wide as groups 24 and 27, but shorter and lower than a group 24.1,5,6,7
  • Group 26 cases are also sold for powersport and UTV machines, not only cars.8,9

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.

Sources

  1. Duracell Ultra car battery, group 26 (SLI26), Batteries Plus
  2. NAPA battery BCI No. 26 (BAT 6526), NAPA Auto Parts
  3. Group 26R battery (SLI26R), Batteries Plus
  4. NAPA battery BCI No. 26R (BAT 7526R), NAPA Auto Parts
  5. What the BCI group size number on your car battery means (Viraaj Bhatnagar, 2026-09-06), Jalopnik
  6. BCI group numbers, dimensional specifications and ratings, Battery Council International
  7. Duracell Ultra car battery, group 24 (SLI24), Batteries Plus
  8. Odyssey Extreme powersport top post battery, group size 26, O'Reilly Auto Parts
  9. Group 26 batteries, Battery Mart

Group 26 batteries listed on eBay

Dimensions are the BCI maximums for the case, terminals excluded. Sources: Battery Council International, "BCI Group Numbers, Dimensional Specifications and Ratings" (batterycouncil.org), read October 15, 2026; Jalopnik, Viraaj Bhatnagar, "What the BCI group size number on your car battery means" (jalopnik.com), September 6, 2026; Battery Mart, "Group 51R batteries" (batterymart.com), read October 16, 2026.