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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 charging amperage
written on the battery?
Adjust the charging voltage to
20 ~ 25 V
Monitor the amperage for 3 ~ 5
minutes. Is the standard charging
amperage exceeded?
Adjust the voltage to obtain the
standard charging amperage
If the amperage does not
exceed the standard charging
amperage after 5 minutes,
replace the battery.
Set the timer to the charging time
determined by the open circuit
voltage.
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 measuring its open-circuit
voltage.
12.8 V → Charging is complete.
12.0 ~ 12.7 V → Recharging is required.
YES
YES
NO
NO
Note:
• Leave the battery unused for more than 30 minutes before measuring its
open-circuit voltage.
• 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.)
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