Yamaha 2014 MT-07 Service Manual

ELECTRICAL COMPONENTS8-130• As shown in the following illustration, theopen-circuit voltage of a VRLA (Valve Reg-ulated Lead Acid) battery stabilizes about30 minutes after charging has been com-pleted. Therefore, wait 30 minutes aftercharging is completed before measuringthe open-circuit voltage.▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼Charging method using a variable-current(voltage) chargera. Measure the open-circuit voltage prior tocharging.TIPVoltage should be measured 30 minutes afterthe engine is stopped.b. Connect a charger and ammeter to the bat-tery and start charging.TIPSet the charging voltage to 16–17 V. If the set-ting is lower, charging will be insufficient. If toohigh, the battery will be over-charged.c. Make sure that the current is higher than thestandard charging current written on the bat-tery.TIPIf the current is lower than the standard chargingcurrent written on the battery, set the chargingvoltage adjust dial at 20–24 V and monitor theamperage for 3–5 minutes to check the battery.d. Adjust the voltage so that the current is at thestandard charging level.e. Set the time according to the charging timesuitable for the open-circuit voltage.f. If charging requires more than 5 hours, it isadvisable to check the charging current aftera lapse of 5 hours. If there is any change inthe amperage, readjust the voltage to obtainthe standard charging current.g. Measure the battery open-circuit voltage afterleaving the battery unused for more than 30minutes.▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼Charging method using a constant volt-age chargera. Measure the open-circuit voltage prior tocharging.TIPVoltage should be measured 30 minutes afterthe engine is stopped.b. Connect a charger and ammeter to the bat-tery and start charging.c. Make sure that the current is higher than thestandard charging current written on the bat-tery.TIPIf the current is lower than the standard chargingcurrent written on the battery, this type of batterycharger cannot charge the VRLA (Valve Regu-lated Lead Acid) battery. A variable voltagecharger is recommended.d. Charge the battery until the battery’s charg-ing voltage is 15 V.TIPSet the charging time at 20 hours (maximum).e. Measure the battery open-circuit voltage afterleaving the battery unused for more than 30minutes.▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲A. Open-circuit voltage (V)B. Time (minutes)C. ChargingD. Ambient temperature 20 °C (68 °F)E. Check the open-circuit voltage.• Standard charging current is reachedBattery is good.• Standard charging current is not reachedReplace the battery.12.8 V or more --- Charging is complete.12.7 V or less --- Recharging is required.Under 12.0 V --- Replace the battery.12.8 V or more --- Charging is complete.12.7 V or less --- Recharging is required.Under 12.0 V --- Replace the battery.