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.

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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.