Operating Instructions and Guidelines
5. Recharge
Battery should be recharged in time after
discharge, the recommended charge methods
are:
Charge the battery with constant current of less
than 0.2C
10
A until the battery boost voltage reach
2.33~2.37Vpc, then charge battery with the
constant voltage 2.33~2.37Vpc until the end of
charge. Charge voltage shall be adjusted along
with ambient temperature, the temperature
compensate coefficient for battery is -3.5mV/
℃
/cell.
Whether the batteries are fully charged can be
decided according to any one of two standards
as follows:
Different discharge depth. Sufficient charging
time varies according to the different discharge
depth. Please note from the table below
Under constant voltage charge condition, the
charge current value maintains the same
during the last three hour when the battery
reaches the final stage of charging.
Table charge time with different DOD
Discharge
depth (%)
Constant
current (A)
Time for constant
voltage converting
to constant voltage
(h)
Constant
voltage
(V/cell)
Charging
time (h)
20
0.1C
10
1.6
2.35
8
0.15C
10
1.2
2.35
6
50
0.1C
10
4.3
2.35
14
0.15C
10
3.3
2.35
12
80
0.1C
10
6.8
2.35
16
0.15C
10
5.5
2.35
14
100
0.1C
10
8.7
2.35
18
0.15C
10
6.8
2.35
16
6.
Storage
GEL batteries should be stored in a dry, clean,
and ventilated location. Since the batteries are
fully charged, the recommended storage time is
as follows:
6 months at ambient temperature no warmer
than 68°F (20
℃
)
3 months at 86°F (30
℃
)
6 weeks at 104°F (40
℃
)
The state of charge can be decided by the testing
result of open circuit voltage after storage for 24
hours at 20±5
℃
.
Table open circuit voltage
State of charge
Voltage (V/cell)
100%
≥2.18
80%
≥2.16
60%
≥2.12
40%
≥2.10
20%
≥2.06
The battery supplemental charge method during
the storage is: charge battery with 2.35V/cell for 8
to 12 hours.
It is necessary to limit the current, and the
optimum limiting value is 0.2C
10
A .
Testing of the open circuit with the storage
battery can decide whether it shall be
supplemental charged. If the voltage drops to
2.10Vpc, the battery shall be supplemental
charged in time.
Improper maintenance will shorten the battery
service life or decrease the service performance.
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Summary of Contents for GFMJ Series
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