![What is the freezing point of battery acid (electrolyte)?](/images/batteries/img-frozen-battery.png)
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) |