What is the freezing point of battery acid (electrolyte)?
Table 1 - Electrolyte Freezing Point
| Digital Voltmeter | State of Charge | Hydrometer Reading | Electrolyte |
| Open Circuit Volts | Approximate | Specific Gravity | Freezing Point |
| >12.65 | 100% | 1.265 | -75°F (-59.4°C) |
| >12.45 | 75% | 1.225 | -55°F (-48.3°C) |
| >12.24 | 50% | 1.190 | -34°F (-36.7°C) |
| >12.06 | 25% | 1.155 | -16°F (-26.7°C) |
| >11.89 | Discharged | 1.120 | -10°F (-23.3°C) |