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INSP
ADJ
BATTERY INSPECTION AND CHARGING
4. Measure:
• Battery charge
È
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 electro-
lyte level.)
É
Open-circuit voltage
Ê
Charging time (hours)
Ë
Time (minutes)
Ì
Charging condition of the battery
Í
Ambient temperature 20 °C (68 °F)
a
Charging
b
Check the open-circuit voltage
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 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.
• 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%
È