Yamaha YFM400FWA 2000 5GH3-AE1 Service Manual page 115

INSP
BATTERY INSPECTION
ADJ
Check the condition of the battery using
the following charts.
Example:
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge condition of the battery = 20 ~ 30%
Charging method for MF batteries
CAUTION:
If it is impossible to set the standard
charging current, be careful not to over-
charge.
When charging the battery, be sure to
remove it from the motorcycle. (If charg-
ing has to be done with the battery
mounted on the motorcycle, be sure to
disconnect the wire at the negative termi-
nal.)
Never remove the sealing caps of an MF
battery.
Make sure that the charging clips are in
full contact with the terminal and that
they are not shorted together. (A cor-
roded clip on the charger may cause the
battery to generate heat in the contact
area. A weak clip spring may cause
sparks.)
Before removing the clips from the bat-
tery terminals, be sure to turn off the
charger's power switch.
The open-circuit voltage variation for the
MF battery, after charging, is shown
below. As shown in the figure, the open-
circuit voltage stabilizes about 30 min-
utes after charging has been completed.
Therefore, wait 30 minutes after charging
is completed before measuring the open-
circuit voltage.
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