Yamaha YZ450FX 2023 Owner's Manual page 134

Checking is finished.
Less than 13.25 V  Go to step (c).
c. Connect the battery charger (special tool)
to the battery and charge it.
Lithium battery charger
90890-05376
Lithium battery charger
DBY-ACC51-70-02
TIP
For instructions on charging and handling the
battery charger, refer to the battery charger's in-
struction manual.
d. If the battery is hot, wait until the battery
has cooled down to the ambient tempera-
ture.
e. Measure the voltage between the battery
terminals.
13.25 V or more  The battery is normal.
Checking is finished.
10 V or more and less than 13.25 V 
Perform from step (c) again.
Less than 10 V  Replace the battery.
TIP
Before replacing the battery, make sure that the
battery temperature is proper (temperature not
more than 65 C (149 F) or less than 0 C (32
F)). Otherwise, wait until the battery tempera-
ture is proper and perform the procedure from
step (c) again.
ELECTRICAL COMPONENTS
7-5