3 - 45
CHK
ADJ
CHECKING AND CHARGING THE BATTERY
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. Lift the hood up.
2. Remove:
• battery case cover
3. Disconnect:
• battery leads
CAUTION:
_
First, disconnect the negative battery lead
1
, and then the positive battery lead
2
.
4. Remove:
• battery
5. Check:
• battery charge
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a. Connect a pocket tester to the battery termi-
nals.
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 termi-
nal is disconnected).
• 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
c. Open-circuit voltage = 12.0 V
d. Charging time = 6.5 hours
e. Charge of the battery = 20 ~ 30%
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Positive tester probe
→
positive battery terminal
Negative tester probe
→
negative battery terminal
Relationship between the open-circuit voltage and the
charging time at 20 °C (68 °F)
These values vary with the temperature, the condition of the battery
plates, and the electrolyte level.
O
pen-
ci
rcuit
volt
age
(V
)
Charging time (hours)
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