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Charging method using a variable-current (voltage) charger
Measure the open-circuit
voltage prior to charging.
Connect a charger and
ammeter to the battery
and start charging.
Is the amperage higher
than the standard charg-
ing amperage written on
the battery?
Leave the battery unused for
more than 30 minutes before
measuring its open-circuit voltage.
Adjust the voltage to obtain
the standard charging amper-
age.
Monitor the amperage for 3 ~ 5
minutes. Is the standard charg-
ing amperage exceeded?
Adjust the charging voltage
to 20 ~ 25 V.
If the amperage does not
exceed the standard charg-
ing amperage after 5 min-
utes, replace the battery.
Set the timer to the charging
time determined by the open-
circuit voltage.
Refer to “CHECKING AND
CHARGING THE BATTERY”.
If the required charging time exceeds 5 hours, it is advisable to
check the charging amperage after 5 hours. If there is any change in
the amperage, readjust the voltage to obtain the standard charging
amperage.
Leave the battery unused for more than 30 minutes before measur-
ing 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.
Charger
Ammeter
Set the charging voltage to 16 ~
17 V. (If the charging voltage is
lower, charging will be insufficient,
if it is higher, the battery will be
over-charged.)
YES
YES
NO
NO
CHECKING AND CHARGING THE BATTERY