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Charging
Correct
charging of a VRLA battery is essential in optimising battery
performance and life. Although a constant voltage charge
should be applied, optimum charging also depends on temperature
(Nominally 20°C), charge current (max 1/4 battery capacity)
and ripple current (minimum). Two basic categories of charging
exist.
Float/Standby
This
charging method is used in applications such as emergency
back-up when the battery is required only upon mains failure
e.g., Alarm Panels, Emergency Lighting, UPS. In each case
the battery is continuously on charge and consequently the
recommended voltages are slightly lower than cyclic charging
so as not to damage the battery. (Float voltage for Yuasa
NP range = 2.275volts/cell). These figures may vary between
different battery types.
Cyclic
Cyclic
charging is used in applications where the battery is repeatedly
discharged then charged, e.g. Portable equipment, Wheel Chairs,
Golf trolleys etc.
A higher charging voltage is used but should NEVER
be left on indefinitely since it will overcharge and destroy
the battery. (Cyclic voltage for Yuasa NP range = 2.4 - 2.5
volts/cell)
For
optimum performance always recharge a battery immediately
after discharging.
Note - Consult the
individual battery specification for the correct charging
voltage or contact Yuasa Technical Department on 08708 500312
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