# Battery Charge Time 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 missing value of the first three entries; one must be left
blank. All calculations for efficiency loss will be done no matter which
value you are trying to calculate. The normally accepted standard for
efficiency loss is 20%. Although 10% and no loss are virtually impossible,
we have included 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 either of the two values. In the event you wish
to calculate the time to charge using a different efficiency rate, try our
alternative **Battery Charge Time Variable Efficiency
Calculator**, which allows that option.
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