Charging method using a variable-current (voltage) charger Measure the open-circuit voltage prior to charging. NOTE: Leave the battery unused for more than 30 minutes before measuring its open-circuit voltage. Charger Ammeter Connect a charger and ammeter to the battery and start charging. NOTE: 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.) NO YES 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. YES NO 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. 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 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.
3 - 77 CHECKING AND CHARGING THE BATTERY CHK ADJ