Hitachi DV18DL - 18V 3.0Ah Lithium Ion Cordless Hammer Drill Service Manual page 9

4-1-9. New Lithium-ion battery
Each of the Types EBM 1830 and EBL 1430 lithium-ion batteries is equipped with the overdischarge protection
circuit, overload protection circuit, and voltage monitoring circuit for each cell to prevent reduction of the battery
life due to overdischarge (overuse) or overcharge (excessive charging) of the battery.
The number of charging/discharging is about 1,500.
Precautions for use of the Types EBM 1830 and EBL 1430 lithium-ion batteries
Each of the Types EBM 1830 and EBL 1430 lithium-ion batteries is equipped with a protective function that
automatically stops output to extend the battery life. The motor may stop automatically in either of the following
case or even if the switch is depressed continuously during operation. This is because the protective
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function is activated. The battery is not faulty.
The motor may stop automatically when the remaining battery level is low (when the battery voltage is
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decreased to about 12 V (Type EBM 1830)/when decreased to about 8 V (Type EBL 1430)). Charge the
battery immediately in such case.
The motor may stop if the Model DV 18DL/DV 14DL is overloaded. In such case, release the switch and
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eliminate the cause of the overload problem. Then the Model DV 18DL/DV 14DL is operable.
Please instruct the customers on the above precautions.
4-1-10. Others
The Models DV 18DL and DV 14DL have the following features common to the previous models.
The terminal is movable according to the movement of the battery to prevent damage to the contact portion.
The contact between the housing and the battery is changed from line contact to surface contact to minimize
rattling due to wear.
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