Narada Power Source CO., LTD TT Series Battery Operation Manual
The method of equalization charge is: First charge the batteries on the constant current of
not larger than 0.2C
20
A till the average voltage of the batteries increases to 2.40V/cell
（
25
℃），
then charge the batteries with constant voltage of 2.40V/cell, the time of equalization charge is
24 hours.
4.2. Charge
Charge the batteries in following conditions. The method is same as that of equalization
charge.
－
After discharge
－
Finish installation
－
Storage time is above three months and open circuit voltage is lower than 2.10V/cell.
If battery need to be fully charged as soon as possible, then fast charge method can be
adopted: limit current less than 0.25C
20
A, charge voltage 2.40V/cell
（
25
℃
).
Whether the batteries are fully charged can be decided according to any one of two
standards as follows:
－
The charge time is 18-24 hours (the charge time can be shortened when the batteries
were not deep discharged, e.g., the charge time of 20%DOD batteries can be shortened to 10
hours).
－
On condition of constant voltage, the value of charge current hasn’t varied for
continuous three hours.
5. Storage
All lead acid batteries experience self-discharge in open circuit. The result is that open
circuit voltage decreases, and the capacity also decreases. During storage please note:
－
The self-discharge rate is related with ambient temperature. The self-discharge rate is
smaller when the ambient temperature is lower, otherwise is larger. The required temperature of
TT batteries’ storage environment is from 0
℃
to 35
℃
. The storage place must be clean,
ventilated and dry.
－
An important parameter in storage is open circuit voltage, which is related with density
of the electrolyte. If the open circuit voltage is lower than 2.17V/cell, or have been stored for
three months, the batteries should be supplemental charged to avoid damage caused by self
discharge.
16
