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Hitachi UC 24YFA Instruction Manual And Safety Instructions page 10

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Regarding recharging time
Table 4 shows the recharging time required according to the type of battery.
Battery
voltage (V)
7.2 V
9.6 V
12V
14.4 V
18 V
24 V
NOTE: The recharing time may vary according to the ambient temperature and the
power supply voltage.
4. Disconnect battery charger from the receptacle.
CAUTION:
Do not pull the plug out of the receptacle by pulling on the cord.
Make sure to grasp the plug when removing from receptacle to avoid damaging cord.
5. Remove the battery from the battery charger.
Supporting the battery charger with hand, pull out the battery from the battery charger.
Regarding electric discharge in case of new batteries, etc.
As the internal chemical substance of new batteries and batteries that have not been
used for an extended period is not activated, the electric discharge might be low when
using them the first and second time. This is a temporary phenomenon, and normal time
required for recharging will be restored by recharging the batteries 2 – 3 times.
How to make the batteries perform longer.
Recharge the batteries before they become completely exhausted.
When you feel that the power of the tool becomes weaker, stop using the tool and
recharge its battery. If you continue to use the tool and exhaust the electric current, the
battery may be damaged and its life will become shorter.
Avoid recharging at high temperatures.
A rechargeable battery will be hot immediately after use. If such a battery is recharged
immediately after use, its internal chemical substance will deteriorate, and the battery
life will be shortened. Leave the battery and recharge it after it has cooled for a while.
10
Table 4 Recharging time (approx. min.) at 20°C
1.3 Ah
EB7
EB9
EB9S
EB12
EB12S
Battery capacity (Ah)
35 min.
35 min.
35 min.
2.0 Ah
EB9B
50 min.
EB12B
50 min.
EB14B
50 min.
EB18B
50 min.
EB1820
EB24B
50 min.

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