Yamaha XG250, Service Manual

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ELECTRICAL COMPONENTS
7-39
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5. Charge:
●
Battery
(refer to the appropriate charging method)
WARNING
EWA13300
Do not quick charge a battery.
CAUTION:
ECA13670
●
Never remove the MF battery sealing caps.
●
Do not use a high-rate battery charger
since it forces a high-amperage current
into the battery quickly and can cause bat-
tery overheating and battery plate dam-
age.
●
If it is impossible to regulate the charging
current on the battery charger, be careful
not to overcharge the battery.
●
When charging a battery, be sure to re-
move it from the vehicle. (If charging has
to be done with the battery mounted on the
vehicle, disconnect the negative battery
lead from the battery terminal.)
●
To reduce the chance of sparks, do not
plug in the battery charger until the battery
charger leads are connected to the bat-
tery.
●
Before removing the battery charger lead
clips from the battery terminals, be sure to
turn off the battery charger.
●
Make sure the battery charger lead clips
are in full contact with the battery terminal
and that they are not shorted. A corroded
battery charger lead clip may generate
heat in the contact area and a weak clip
spring may cause sparks.
●
If the battery becomes hot to the touch at
any time during the charging process, dis-
connect the battery charger and let the
battery cool before reconnecting it. Hot
batteries can explode!
●
As shown in the following illustration, the
open-circuit voltage of an MF battery sta-
bilizes about 30 minutes after charging
has been completed. Therefore, wait 30
minutes after charging is completed be-
fore measuring the open-circuit voltage.
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Charging method using a variable-current
(voltage) charger
a. Measure the open-circuit voltage prior to
charging.
NOTE:
Voltage should be measured 30 minutes after
Example
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge of the battery = 20
– 30%
A. Open-circuit voltage (V)
B. Charging time (hours)
C. Charge of the battery (%)
B
A
A
C
A. Open-circuit voltage (V)
B. Charge
C. Minites
D. Check the open-circuit voltage.
A
D
C
B