Group U2
General-Utility Batteries 12-Volt (6 Cells)
What BCI publish
- Nominal voltage
- 12 V
- Maximum overall
- 160 × 132 × 181 mm6 5/16 × 5 3/16 × 7 1/8 in
- Post / terminal
- A3,X
- Assembly figure
- 10
- Cold cranking, for reference only
- 84-235
Source: batterycouncil.org/wp-content/uploads/2023/10/BCI-Group-Sizes.pdf
A maximum, not a target. BCI say the height shown includes raised quarter covers and that a flat-top design runs about 10 mm lower, and that batteries within a group “must be the same physical size (i.e., within 2mm)”.