Charging Time Required

The time required to charge a battery will vary depending upon the following factors:
- The size of the battery - A completely discharged, large, heavy-duty battery requires more than twice the recharging time as a completely discharged, smaller capacity battery.
- The temperature - A longer time is needed to charge any battery at -18°C (0°F) than at 27°C (80°F). When a fast charger is connected to a cold battery, the current accepted by the battery is very low at first. As the battery warms, the battery accepts current at a higher rate.
- The charging capacity - The higher the charger amperage, the faster the battery will charge.
- The state-of-charge - A completely discharged battery requires more than twice as much charge time as a half charged battery. Because the electrolyte is nearly pure water and a poor conductor in a completely discharged battery, the battery accepts very low current at first. Later, as the charging current causes the electrolyte acid content to increase, the charging current also increases.