Charging method using a constant 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. Connect a charger and ammeter to the battery and start charging. NO YES Is the amperage higher than the standard charg- ing amperage written on the battery? Charge the battery until the charging voltage reaches 15 V. This type of battery charger cannot charge an MF battery. A variable- voltage charger is recommended. NOTE: Set the charging time to a maxi- mum of 20 hours. Charger Leave the battery unused for more than 30 minutes before measuring its open-cir- cuit voltage.
12.8 V Charging is complete. 12.0 ~ 12.7 V Recharging is required. Under 12.0 V Replace the battery. Ammeter Voltmeter CAUTION: Constant amperage chargers are not suitable for charging MF batteries. 3 - 78 CHECKING AND CHARGING THE BATTERY CHK ADJ