Points Requiring Special Attention During Sales Promotion - Hitachi UC 18SD Technical Data And Service Manual

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 when the storage battery temperature is high
Charging may not be possible if the temperature of the battery is 40 ˚C (104 ˚F) or higher after it 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 competitor's models) which
employ temperature sensitive devices to terminate charging. The cooling period required before charging varies
from a few minutes to about 30 minutes, depending on the length of time the battery was used and the ambient
temperature.
(minutes)
140
120
100
80
60
40
20
0
95 % of Rated voltage
rated (Voltage listed
voltage on nameplate)
Input power supply voltage
Fig. 1 Relationship between input power supply
voltage and charging time
Ambient temperature
10 C (50 F)
20 C (68 F)
Storage battery: EB 1812S
105 % of
rated
voltage
6-2-2. If the ambient temperature or power supply
voltage is low, charging time may be longer
The charging time is greatly influenced by the ambient
temperature and input power supply voltage.
The relationship between input power supply voltage
and charging time is shown in Fig. 1.
If the input power supply voltage is high, charging
takes less time; if low, it takes more time. 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.
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