Yamaha TT-R90(T) - Page 170

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INSP
ADJ
BATTERY INSPECTION AND CHARGING (TT-R90E)
N
OTE:
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
● Rear fender
2. Disconnect:
● Battery lead coupler 1
(from the battery terminals)
N
OTE:
Push down on the tab a, and then remove the
battery lead coupler.
3. Remove:
● Battery
1
a
4. Measure:
● Battery charge
Measurement steps:
● Connect a pocket tester 1 to the battery
terminals.
Tester positive probe →
battery positive terminal
Tester negative probe →
battery negative terminal
N
OTE:
● 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).
● No charging is necessary when the open-
circuit voltage equals or exceeds 12.8 V.
1