Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 207

Relationship between the open-circuit voltage and the
charging time at 20 °C
Charging time (hours)
These values vary with the temperature, the condition of the battery
plates, and the electrolyte level.
Charging Ambient temperature
20 °C
Check the open-circuit
voltage.
Charging condition of the battery (%)
CHECKING THE BATTERY
G
Check the condition of the battery using the
following charts.
Example:
G
Open-circuit voltage = 12.0 V
G
Charging time = 6.5 hours
G
Charge condition of the battery = 20 ~ 30%
G
Charging method for MF batteries
CAUTION:
If it is impossible to set the standard
G
charging current, be careful not to over-
charge.
When charging the battery, be sure to
G
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.)
Time (minutes)
Never remove the sealing caps of an MF
G
battery.
Make sure that the charging clips are in
G
full contact with the terminal and that they
Ambient
temperature
are not shorted together. (A corroded clip
20 °C
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-
G
tery terminals, be sure to turn off the
charger's power switch.
The open-circuit voltage variation for the
G
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.
3 - 60
CHK
ADJ