Yamaha WR450F(S) Owner's Service Manual page 284

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BATTERY INSPECTION AND CHARGING
Check the charge of the battery, as shown
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in the charts and the following example.
Example
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge of the battery = 20 ~ 30%
Å Relationship between the open-circuit voltage
and the charging time at 20 ˚C (68 ˚F)
(These values vary with the temperature, the
condition of the battery plates, and the electro-
lyte level.)
ı Open-circuit voltage
Ç Charging time (hours)
Î Time (minutes)
‰ Charging condition of the battery
Ï Ambient temperature 20 ˚C (68 ˚F)
a Charging
b Check the open-circuit voltage.
5. Charge:
Battery
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(refer to the appropriate charging
method illustration)
WARNING
Do not quick charge a battery.
CAUTION:
Never remove the MF battery sealing
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caps.
Do not use a high-rate battery charger
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since it forces a high-amperage current
into the battery quickly and can cause
battery overheating and battery plate
damage.
If it is impossible to regulate the charging
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current on the battery charger, be careful
not to overcharge the battery.
When charging a battery, be sure to
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remove it from the machine. (If charging
has to be done with the battery mounted
on the machine, disconnect the negative
battery lead from the battery terminal.)
To reduce the chance of sparks, do not
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plug in the battery charger until the bat-
tery charger leads are connected to the
battery.
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