Battery Charge Time Variable Efficiency Calculator This calculator requires the use of Javascript enabled and capable browsers. It is
designed to calculate the maximum battery charge time for any given
chargable battery, based on the entered information. The calculator will
calculate the time after you enter the battery rating capacity, charge
rate and the efficiency of the charging system, including the battery. The
normally accepted standard for efficiency loss is 20%. Although smaller
loss factors up to and including no loss are virtually impossible, we have
allowed the potential for reasons of understanding. 30% and 40% are far
more likely than 10%. If loss is above 40%, you need to attempt to find
the reason by changing the charger or replacing the battery. Typical
entries for our calculator might be a 1000mAh rating and 50mA of charge
current. That would yield a realistic charge time of 24 hours. Click on
Calculate after entering the two values. In the event you wish to
calculate either of the first two variables, try our alternative Battery Charge Time Calculator, which allows that
option.
