# How to Calculate the charging Time and Charging current for battery Charging?

here we will going to discuss about how to calculate the battery charging current and time. it would be Easily explain with 100Ah battery to calculate  Battery Charging Time and battery Charging Current. ## Battery Charging Current and Battery Charging Time formula

Here is the formula of Charging Time of a Lead acid battery.
Charging Time of battery = Battery Ah / Charging Current
T = Ah / A

Example,
Suppose for 100 Ah battery,
First of all, we will calculate charging current for 100 Ah battery. As we know that charging current should be 10% of the Ah rating of battery.
so charging current for100Ah Battery = 100 x (10/100) = 10 Amperes.
but due to losses, we can take 10-12Amperes for charging purpose.
suppose we took 11 Amp for charging purpose,
then charging time for 100Ah battery = 100 / 11 = 9.09 Hrs.
but this was an ideal case…
practically, there will be some  40% of losses ( in case of battery charging)
then 100 x (40 / 100) = 40 …..(100Ah x 40% of losses)
therefore,  100 + 40 = 140 Ah ( 100 Ah + Losses)
Now Charging Time of battery = Ah/Charging Current
140 / 11 = 12.72 or 13 Hrs ( in real case)

Therefore, an 100Ah battery required 13 Hrs for completely charging with charging current 11 ampere