Charging method using a constant voltage charger
Measure the open-circuit
voltage prior to charging.
Connect a charger and
ammeter to the battery
and start charging.
Charge the battery until the charging
voltage reaches 15 V.
Leave the battery unused for more
than 30 minutes before measuring
its open-circuit voltage.
This type of battery charger cannot
charge an VRLA battery. A variable-
voltage charger is recommended.
Set the charging time to a maxi-
mum of 20 hours.
Leave the battery unused for more than 30
minutes before measuring its open-circuit
voltage.
12.8 V → Charging is complete.
12.0 ~ 12.7 V → Recharging is required.
Under 12.0 V → Replace the battery.
Is the amperage higher
than the standard charg-
ing amperage written on
the battery?
Charger
Ammeter
Voltmeter
Constant amperage chargers are not suitable
for charging VRLA batteries.
YES
NO
CHECKING AND CHARGING THE BATTERY
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