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A
A
P
P
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P
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N
F
F
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Alarm&Security System
Cable Television
Solar and Wind Power System
Emergency Lighting
Medical Equipment
UPS Generator Starting
Communication Equipment
Power tools &Control Equipment/
Toys
B
B
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A
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T
T
T
E
E
R
R
Y
Y
C
C
H
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G
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G
G
Correct battery charging ensures the maximum possible working life for the battery. There
are four major methods of charging:
Constant Voltage Charging.
Constant Current Charging.
Two Stage Constant Voltage Charging.
Taper Current Charging.
Constant Voltage Charging:
This is the recommended method of charging for VRLA batteries. It is necessary to closely
control the actual voltage to ensure that it is within the limits advised.
Float Service: 2.25-2.30 Vpc at 25
℃
.
Cycle Service: 2.4-2.45 Vpc at 25
℃
FULI
suggests that the initial current be set within 0.2 C Amps. Figure 1 shows one
example of a constant voltage charging.
Constant Current Charging
This method of charging is generally not recommended for VRLA batteries, but is an effective method for charging a number of series connected batteries at the same time. It is necessary to
understand that if the batteries are not removed from the charger after reaching a state of full charge, considerable damage will occur to the batteries due to overcharging. Figure 2 shows
the characteristics of a FULI battery under constant current charging conditions.
Two Stage Constant Voltage Charging
Figure 1
Figure 2
