How a Lead Acid Battery Works

When power is drawn from a battery the output voltage will gradually decay. Batteries will function well if they are not drawn down below 85% of their rated voltage. In the case of lead-acid batteries this would be 1.7 volts per cell.

When batteries are recharged the chemical process within the battery is reversed and potential voltage output should be restored to its original rating.

When discharging batteries, they must not be discharged to a voltage below 80% or their nominal rating because the total battery life will be severely shortened.