Electrolyte Freezing

The freezing point of electrolyte depends on its specific gravity. A fully charged battery will not freeze until the ambient temperature gets below -54 °C (-65 °F). However, a battery with a low state of charge may freeze at temperatures as high as -7 °C (20 °F). Since freezing may ruin a battery, the battery should be protected against freezing by keeping it properly charged above 80 percent state of charge, the freezing point of the battery will be somewhere below -32 °C (-25 ° F).