The Group 40 battery is a common automotive size used in many cars and trucks. It typically measures about 10.25 inches long, 6.81 inches wide, and 7.5 to 7.9 inches tall, with small variations by brand. When replacing, always check the exact label on the battery or your vehicle’s manual to confirm the precise fit.
Physical dimensions
Common measurements and tolerances for Group 40 batteries are provided below to help with fitment and replacements.
- Length: about 10.25 inches (261 mm)
- Width: about 6.81 inches (173 mm)
- Height: about 7.5–7.9 inches (191–201 mm) including terminals
- Terminal arrangement: most Group 40 batteries use top-post terminals; some models offer side-terminal variants
Dimensions can vary slightly between brands and models. Always verify the exact measurements on the product label and compare with the space in your engine bay or battery tray.
Electrical characteristics
In addition to size, performance depends on the battery’s chemistry and rating. The numbers below cover typical ranges you may encounter when shopping for Group 40 batteries.
- Cold-cranking amps (CCA): commonly 600–750 A for standard flooded models; AGM variants can be higher, often 750–900 A
- Reserve capacity (RC): typically 110–170 minutes, depending on the model
- Voltage: 12-volt nominal system
- Chemistry options: flooded lead-acid or absorbed glass mat (AGM) variants are common within the Group 40 family
Because specifications vary by manufacturer and battery type, always read the product label for exact CCA, RC, and chemistry before purchase.
Compatibility and replacement tips
Group size (40) defines fit in terms of dimensions and general terminal layout, but it does not guarantee performance. When replacing a battery, ensure the new unit matches the group size and verify CCA/RC to suit your vehicle and climate. If your vehicle requires a specific option (e.g., AGM for heavy electrical use or a side-terminal design), confirm the exact model before buying.
Summary
In short, a Group 40 battery is a mid-size automotive option with typical dimensions around 10.25 inches long, 6.81 inches wide, and 7.5 to 7.9 inches high. Performance varies by brand and chemistry, with CCA generally in the 600–750 range for standard flooded models and higher for AGM variants, and reserve capacity commonly between 110 and 170 minutes. Always check the product label and your vehicle’s specifications to ensure a proper fit and reliable performance.