Battery Dimensions & Terminals

Battery Data · Last reviewed 2026-09-15

Direct answer: A battery group fixes the physical footprint — length, width, height — and the terminal type and position. Dimensions vary slightly by manufacturer and terminal style, so the values below are typical and must be confirmed against the original battery before replacement.

Typical dimensions and terminals by group

Group	Typical L × W × H	Terminal
H4 (L1)	~207 × 175 × 190 mm	SAE / DIN post
H5 (L2)	~242 × 175 × 190 mm	SAE / DIN post
H6 (L3)	~278 × 175 × 190 mm	SAE / DIN post
H7 (L4)	~315 × 175 × 190 mm	SAE / DIN post
H8 (L5)	~352 × 175 × 190 mm	SAE / DIN post
H9 (L6)	~394 × 175 × 190 mm	SAE / DIN post
JIS D23 (55/65/75D23)	~232 × 173 × 202–225 mm	JIS type A (small/large post)
JIS N150 (145G51)	~508 × 222 × 212 mm	JIS type A (large taper post)
JIS N200 (190H52)	~520 × 278 × 220 mm	JIS type A (large taper post)
BCI Group 31	~330 × 173 × 240 mm	SAE stud / post
BCI Group 8D	~527 × 283 × 250 mm	SAE stud

Terminal types

SAE post — the tapered round posts standard on most North American and European batteries (positive larger than negative).
JIS type A / B — the Japanese tapered posts; the "A" post is larger and carries more current (heavy-duty).
Stud (threaded) — a threaded terminal common on commercial and marine batteries.

The terminal dimension data

Terminal	Typical dimensions
SAE post (positive / negative)	Top ~17.5 mm / ~15.9 mm, tapered
JIS pencil post	~12.7 mm / ~11.1 mm, tapered
Stud (marine / heavy duty)	3/8" threaded common

Typical values — the taper and the positive-larger rule are the anti-reversal design; exact dimensions belong to the group's specification.

Why the exact fit matters

The battery must match the tray in length, width and height, and the terminals must match the cable ends and their position and polarity. A battery that is too tall can short on the hood; a terminal that is on the wrong side can prevent the cables from reaching. This is why "group size" is a fit spec first — the performance numbers (capacity and CCA) come second.

Return to Battery Data · World Battery Hub. Informational, not purchasing advice.

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