Yamaha Raptor 90 YFM90RA 2011 Service Manual page 94

CHECKING AND CHARGING THE BATTERY
Charging method using a constant voltage charger
Charge the battery until the charging
voltage reaches 15 V.
TIP
Set the charging time to a maxi-
mum of 20 hours.
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.
NOTICE
Constant amperage chargers are not
suitable for charging VRLA batteries.
Measure the open-circuit
voltage prior to charging.
Connect a charger and
ammeter to the battery
and start charging.
Is the amperage higher
YES
than the standard charg-
ing amperage written on
the battery?
3 - 42
CHK
ADJ
TIP
Leave the battery unused for more
than 30 minutes before measuring
its open-circuit voltage.
NO
This type of battery charger cannot
charge an VRLA battery. A variable-
voltage charger is recommended.
Charger
Voltmeter
Ammeter