FLOODED LEAD-ACID BATTERY - CHARGE EFFICIENCY / CHARGE FACTOR
Charge efficiency is a measure of the energy you may take out of a charged battery divided by the energy required to charge it. Charge efficiency will depend on a number of factors including the rate of charging or discharging. Charge efficiency for Flooded deep cycle models is typically ~80%. This should be reduced 1% per year after the third (3) year of operation.