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Measure the open-circuit
voltage prior to charging.
Connect a charger and am-
meter to the battery and
start charging.
Is the amperage higher
than the standard charging
amperage written on the
battery?
Adjust the charging voltage to
20 X 25 V.
Adjust the voltage to obtain the
standard charging amperage.
Monitor the amperage for 3 X
5 minutes. Is the standard
charging amperage exceed-
ed?
Set the timer to the charging
time determined by the open-
circuit voltage.
Refer to “CHECKING AND
CHARGING THE BATTERY”.
If the amperage does not
exceed the standard charg-
ing amperage after 5 min-
utes, replace 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 am-
perage, readjust the voltage to obtain the standard charging amper-
age.
Leave the battery unused for more than 30 minutes before measur-
ing its open-circuit voltage.
12.8 V ! Charging is complete.
12.0 X 12.7 V ! Recharging is required.
Under 12.0 V ! Replace the battery.
YES NO
YES
NO
NOTE:
Leave the battery unused for more than
30 minutes before measuring its open-
circuit voltage.
NOTE:
Set the charging voltage to 16 X 17 V.
(If the charging voltage is lower charg-
ing will be insufficient, if it is higher, the
battery will be over-charged.)
Charger
Ammeter
CHK
ADJ
CHECKING AND CHARGING THE BATTERY
Charging method using a variable-voltage charger