Yamaha YZF-R6 99, Service Manual

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3-60
Relationship between the open-circuit voltage
and the charging time at 20
_
C
Open-circuit voltage (V)
These values vary with the temperature, the condition of
the battery plates, and the electrolyte level.
13.0
12.5
12.0
11.5
5 6.5 10
Charging time (hours)
CHECKING AND CHARGING THE BATTERY
CHK
ADJ
NOTE:
CAUTION:
NOTE:
Since MF batteries are sealed, it is not possible
to check the charge state of the battery by mea-
suring the specific gravity of the electrolyte.
Therefore, the charge of the battery has to be
checked by measuring the voltage at the battery
terminals.
1. Remove:
S
rider seat
Refer to “SEATS”.
2. Disconnect:
S
battery leads
(from the battery terminals)
First, disconnect the negative lead 2 , then
the positive lead
1
.
3. Remove:
S
battery
4. Measure:
S
battery charge
a. Connect a digital voltmeter to the battery ter-
minals.
Tester positive probe battery positive
terminal
Tester negative probe
battery nega-
tive terminal
S
The charge state of an MF battery can be
checked by measuring its open-circuit voltage
(i.e., the voltage when the positive terminal is
disconnected).
S
No charging is necessary when the open-cir-
cuit voltage equals or exceeds 12.8 V.
b. Check the charge of the battery, as shown 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%