| Battery (For non-maintenance-free batteries:) | Standard specific gravity | 1.25 to 1.29 at 20°C (68°F) | |
| Charging circuit without load | Standard amperage | 10 A or less | |
| Standard voltage | 13.2 to 14.8 V | ||
| Charging circuit with load | Standard amperage | 30 A or higher | |
| Generator rotor assembly resistance | Between the slip rings | for 100A Type | 1.8 to 2.2 Ω at 20°C (68°F) |
| for 130A Type | 2.3 to 2.7 Ω at 20°C (68°F) | ||
| Slip rings and rotor | 10 kΩ or higher | ||
| Generator rotor assembly slip ring diameter | Standard diameter | 14.2 to 14.8 mm (0.559 to 0.583 in.) | |
| Minimum diameter | 14.0 mm (0.551 in.) | ||
| Generator brush holder assembly | Standard exposed length | 9.5 to 11.5 mm (0.374 to 0.453 in.) | |
| Minimum exposed length | 4.5 mm (0.177 in.) | ||