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Group 31 Battery

Aliases: 31 · Standard family: BCI/SAE

Direct answer: The Group 31 battery is a BCI/SAE-family group — a 12V lead-acid case of 330 × 173 × 240 mm with SAE stud / post terminals, typically 100 Ah and 900 cold cranking amps (SAE J537 (−18°C)).

Quick facts

Identification

Entity type	BatteryGroup
Group name	Group 31
Aliases	31
Standard family	BCI/SAE

Specification

Voltage	12V
Typical capacity	100 Ah
Typical CCA	900 A
Dimensions (L×W×H)	330 × 173 × 240 mm
Terminal	SAE stud / post

Standards & measurement context

Naming standard	BCI/SAE
CCA basis	SAE J537 (−18°C)

The CCA figure is defined by its test standard — values from different standards are not directly interchangeable. Capacity values are typical ranges, not a substitute for a specific battery's datasheet.

Applications

Commercial
Marine
Trucks

Technology variants

Flooded / AGM — see the lead-acid type family for the design trade-offs behind the label.

Equivalent capacity class

~100–105 Ah — other groups in a similar capacity class. This is a capacity comparison, not a physical interchange: dimensions and terminals differ between naming families.

Testing

Relevant methods for this group: CCA testing, capacity testing, load testing — see the testing methods for procedures and standards.

Sources & verification

CCA 900 A — SAE J537 (−18°C)

Source: BCI + manufacturer datasheets · Date: 2026-09 · Confidence: High

Last verified: 2026-09

Values are cross-verified typical ranges, not a substitute for a specific battery's datasheet. Return to World Battery Hub.