Yamaha BT1100 2002 Service Manual page 92

Voltmeter
Relationship between open-circuit
13,0
voltage and charging time at 20 °C
12,5
12,0
11,5
5 6,5
Charging time (Hours)
• This varies depending on the temperature, the state of
charge in battery plates and the electrolyte level.
CHECKING AND CHARGING THE BATTERY
1
1
+
-
2
10
3-38
NOTE:
Since MF batteries are sealed, it is not possible to
check the charge state of the battery by measuring
the specific gravity of the electrolyte. Therefore, the
charge of the battery has to be checked by meas-
uring the voltage at the battery terminals.
1. Remove:
• seat
• storage compartment 1
2. Disconnect:
• battery leads
(from the battery terminals)
CAUTION:
First, disconnect the negative lead 1, then the
positive lead 2.
3. Remove:
• battery
4. Check:
• battery charge
a. Connect a pocket tester to the battery termi-
nals.
Tester positive
lead
Tester negative
lead
NOTE:
• The charge state of a 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.
b. Check the charge of the battery, as shown in
the charts and the following example.
Example
c. Open-circuit voltage = 12.0 V
d. Charging time = 6.5 hours
e. Charge of the battery = 20 ~ 30 %
5. Charge:
• battery
(refer to the appropriate charging method
illustration)
INSP
ADJ
Battery positive
terminal
Battery negative
terminal