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(5) 18 V Ni-MH battery
The charging current is switched (7.5 A/6 A/5 A/4 A/1.3 A) according to the battery temperature at the start of
charging. Therefore, the charging time changes as shown in Fig. 11.
(Min.)
Fig. 11 Relationship between battery temperature at the start of charging,
Note) Charging times may be longer according to the increase in battery temperature. However, the
thermistor that is a battery surface temperature sensor stops charging before the battery is
fully charged. Thus charging is stopped at an early stage.
Relationship between temperature of battery/charger and charging current
Battery temperature at the start of charging
is between 5˚C and 40˚C.
Battery temperature at the start of charging
is between 40˚C and 50˚C.
Battery temperature at the start of charging
is between -5˚C and 5˚C.
Battery temperature at the start of charging
is -5˚C or less.
Battery temperature becomes over 45˚C
during charging at 7.5 A or 6 A.
Battery temperature becomes over 5˚C
during charging a low-temperature battery
(5˚C or less).
Inside of the charger becomes hot during
charging at 7.5 A (see Fig. 13).
(*) The battery is also charged at 1.3 A when the battery is near the end of its service life.
Otherwise, the battery temperature becomes high due to the high internal resistance and it is
dangerous.
Charging time
Battery temperature at the start of charging
In the case of 3.0 Ah Ni-MH battery Model EB 1830H
charging time and current
Temperature
Charging current (mean value)
(Note)
Charging current
7.5 A
4 A
Switch from 1.3 A to 4 A
1.3 A (*)
Switch from 7.5 A (6 A) to 4 A
Switch from 4 A to 6 A
Switch from 7.5 A to 5 A
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Purpose
Protection of the battery
Saving the charging time
Protection of the battery
Saving the charging time
Protection of the charger
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