Group 65 battery size

Close in size

No other group in the BCI table comes within 10 mm (0.4 in) of group 65 on all three sides: look for group 65 itself.

Before you buy a group 65 battery

• Read the group number on the label of the battery in your car, or in the owner's manual: it should say 65.
• 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 65 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 65

• Retailers' specifications list the positive terminal of a group 65 battery on the left, as on group 59, but not every guide agrees: check your old battery before you buy.^1,2,3
• Group 65 is common in many Ford vehicles, including Lincoln and Mercury models.^4,5
• Group 65 batteries are made in AGM as well as standard flooded versions.^1,3
• NAPA, Batteries Plus and O'Reilly list a group 65 at 12 in long, within 2 mm of the 12.05 in BCI figure; Odyssey lists 11.8 in (300 mm) for its group 65 AGM.^6,7,8,9

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.