Battery groups › 34
BCI battery group
Group 34 battery size
A BCI group 34 battery is at most 260 mm long, 173 mm wide and 200 mm tall (10.24 × 6.81 × 7.87 in), according to the Battery Council International group chart.
| Maximum size | 260 × 173 × 200 mm |
|---|---|
| In inches | 10.24 × 6.81 × 7.87 |
| Terminal types | A |
| Polarity | Standard layout for this group |
| Cold cranking amps (OE range) | 235–1000 A |
Cars whose manuals point to group 34
None of the owner's manuals this site has read so far print group 34. Most Japanese and Korean makers print a case size or capacity instead of a BCI group, so the battery label on the car is the better guide.
Measuring for a group 34
To take a group 34, the tray needs at least 260 mm (10.24 in) of length and 173 mm (6.81 in) of width inside the hold-down, and 200 mm (7.87 in) of height below the hood or any bracket, with room left for the cable ends. These are BCI maximums: a real group 34 battery can be a few millimetres smaller, never larger. Original-equipment batteries in this group were rated from 235 to 1000 cold cranking amps, so the right rating depends on the car; match or exceed the rating on the battery you are replacing.
Nearby sizes
| Group | L × W × H (mm) | Difference from 34 |
|---|---|---|
| 34R | 260 × 173 × 200 | 0 mm length, 0 mm width, 0 mm height |
| 100 | 260 × 179 × 188 | 0 mm length, +6 mm width, -12 mm height |
| 36R | 263 × 183 × 206 | +3 mm length, +10 mm width, +6 mm height |
| 97R | 252 × 175 × 190 | -8 mm length, +2 mm width, -10 mm height |
| 78 | 260 × 180 × 186 | 0 mm length, +7 mm width, -14 mm height |
Positive numbers mean the other group is bigger than group 34. A bigger case only fits if your tray and hold-down have that much spare room; measure inside the hold-down frame, not the old battery.
Fitting a group 34
The group sets the case size, terminal position and hold-down. A battery from another group can only replace it when the length, width and height all fit the tray and the terminals land on the same sides. No other passenger-car group in the BCI chart has exactly the same case size and polarity. Use the tray fit checker to list every group that fits a measured space.
Source: Battery Council International, BCI Group Sizes (Oct 2023 PDF), page 6. Checked 2026-10-20.