Yamaha YZF-R1 1998 Service Manual page 126

CHECKING AND CHARGING THE BATTERY
NOTE:
Since MF batteries are sealed, it is not
possible to check the charge state of the
battery by measuring the specific grav-
ity of the electrolyte. Therefore, the
charge of the battery has to be checked
by measuring the voltage at the battery
terminals.
1. Remove:
• rider seat
Refer to "SEATS".
2. Disconnect:
• battery leads
(from the battery terminals)
CAUTION:
ACHTUNG:
First, disconnect the negative lead 1,
then the positive lead 2.
3. Remove:
• battery
4. Measure:
• battery charge
a. Connect a digital voltmeter to the bat-
tery terminals.
Tester positive probe → battery posi-
tive terminal
Tester negative probe → battery
negative terminal
NOTE:
• The charge state of an MF battery can
be checked by measuring its open-cir-
cuit voltage (i.e., the voltage when the
positive terminal is disconnected).
• No charging is necessary when the
open-circuit 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%
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CHK
ADJ