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Points Requiring Special Attention During Sales Promotion - Hitachi UC 9SF Techical Data And Service Manual

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6-2. Points Requiring Special Attention During Sales Promotion

The customer should be advised of the following points during sales promotion of the charger.
6-2-1. Charging may not be possible at high storage battery temperature
Charging may not be possible when the battery temperature is 40°C (104°F) or higher after the
battery has been exposed to direct sunlight for a long time or immediately after it has been used.
In such cases, the customer should be advised to place the battery in the shade with good airflow,
and allow it to cool sufficiently prior to recharging. This condition is common to all existing chargers
(both Hitachi's and its competitor's models) that employ temperature-sensitive devices to
terminate charging. The cooling period required before charging varies from a few minutes to
about 30 minutes, depending on how long the battery was used and the ambient temperature.
6-2-2. Charging time may be longer under low ambient temperature or power supply voltage
The charging time is greatly influenced by the ambient temperature and input power supply
voltage.
Fig. 1 shows the relation between input power supply voltage and charging time.
Charging takes less time under high input power supply voltage; it takes more time under low
voltage. Be sure to advise the customer to charge the batteries at the ambient temperature
specified in the Handling Instructions and at the rated voltage listed on the nameplate.
(minutes)
360
300
240
180
s s
120
Fig. 1 Relation between input power supply voltage and charging time
95% of
Rated voltage
rated voltage
(Voltage listed
on nameplate)
Input power supply voltage
-4-
Ambient temperature
at below 0°C (below 32°F)
at 0°C to 40°C (32 to 104°F)
Storage battery: 1.2 Ah Battery
105% of
rated voltage

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