Yamaha WR450F(T) Owner's Service Manual page 282

BATTERY INSPECTION AND CHARGING
NOTE:
Since MF batteries are sealed, it is not possi-
ble to check the charge state of the battery by
measuring the specific gravity of the electro-
lyte. Therefore, the charge of the battery has to
be checked by measuring the voltage at the
battery terminals.
1. Remove:
• Seat
2. Disconnect:
• Battery leads
(from the battery terminals)
CAUTION:
First, disconnect the negative battery lead
1, and then the positive battery lead 2.
3. Remove:
• Battery band
• Battery
4. Measure:
• Battery charge
Measurement steps:
• Connect a pocket tester 1 to the battery
terminals.
Tester positive probe →
Tester negative probe →
NOTE:
• The charge state of an MF battery can be
checked by measuring its open-circuit volt-
age (i.e., the voltage when the positive ter-
minal is disconnected).
• No charging is necessary when the open-
circuit voltage equals or exceeds 12.8 V.
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INSP
ADJ
battery positive terminal
battery negative terminal