Final answer:
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because increased internal resistance generates sufficient heat to prevent freezing.
Step-by-step explanation:
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because
increased internal resistance generates sufficient heat to prevent freezing. Lead-acid batteries function through chemical reactions between lead plates and an electrolyte solution of sulfuric acid. When the battery is charged, the electrical resistance within the battery increases, which generates heat and prevents freezing at low temperatures.