Hitachi UC 24YJ, Технические данные и руководство по обслуживанию

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Fig. 11 Relationship between battery temperature at the start of charging,
charging time and current
Charging time
Charging current (mean value)
(Min.)
Charging time
Battery temperature at the start of charging
Charging current (mean value)
In the case of 3.0 Ah Ni-MH battery Model EB 1830H
Relationship between temperature of battery/charger and charging current
Temperature
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.
Charging current
Switch from 7.5 A to 5 A
7.5 A
Switch from 7.5 A (6 A) to 4 A
Switch from 1.3 A to 4 A
Purpose
Protection of the battery
Protection of the battery
(*) 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.
(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.
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.
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).
Switch from 4 A to 6 A
4 A
1.3 A (*)
Saving the charging time
Saving the charging time
Protection of the charger
(Note)