Group 34 battery size

Same box, other group numbers

• Group 34R: 10.24 x 6.81 x 7.87 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 36R: 10.35 x 7.20 x 8.11 in, different terminal layout (BCI figure 19, not 10).
• Group 97R: 9.92 x 6.89 x 7.48 in, different terminal layout (BCI figure 15, not 10).

Before you buy a group 34 battery

• Read the group number on the label of the battery in your car, or in the owner's manual: it should say 34.
• 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 34 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 34

• A dual-terminal 34/78 battery puts group 34-style top posts and group 78-style side terminals on one case.^1,2,3
• Listings for group 34 do not agree on length: NAPA and Batteries Plus list 10.75 in and Odyssey 10.8 in for its AGM, longer than the 10.24 in BCI figure, while Interstate lists 10 1/4 in.^4,5,6,7

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.