Reference and 3D viewer

Battery group sizes and their dimensions

A battery group size is a standardized case footprint (length x width x height). Lithium drop-ins are built to these same boxes, so the group number tells you whether a battery fits your existing tray. Pick a group to see it rendered in 3D with all three dimensions annotated.

Length Width Height
Group 24 Marine / RV / deep-cycle
Length
260 mm
10.2 in
Width
173 mm
6.8 in
Height
225 mm
8.9 in
Footprint (L x W): 260 x 173 mm. Case volume: 10.1 L.

Not sure of your group? Find it by measurement

Measure the battery case only in millimetres - ignore the terminal posts and carry handles. We match the nearest BCI group and show close alternatives, since a few millimetres out is easy to do.

Know your group size? See the lithium that drops in.

The free tool matches your lead-acid to a 12V LiFePO4 replacement, shows the weight you save, and checks it against your tray.

Find my battery

Dimensions are nominal BCI (Battery Council International) maximum case sizes, shown length x width x height, the usual order on a spec sheet. Real products vary by a few millimetres and terminal posts/handles can add height, so always check the exact model and your tray before buying. Group sizes ending in R (for example 24R, 51R, 94R) share the same case as the non-R version; the R only means the positive terminal is on the opposite side.