Hitachi DB 10DL Technical Data And Service Manual page 5

Equipped with the new lithium-ion battery (BCL 1015)
The newly developed Type BCL 1015 lithium-ion battery (10.8 V, 1.5 Ah) can be fully charged by the Model
UC 10SFL charger in about 40 minutes.
The Type BCL 1015 is equipped with the overdischarge protection circuit, overload protection circuit,
battery overheat protection circuit and voltage monitoring circuit for each cell to prevent reduction of the
battery life due to overdischarge (overuse) or overcharge (excessive charging). This battery is safe thanks
to these protection circuits.
The Type BCL 1015 lithium-ion battery is equipped with a protective function that automatically stops output
to extend the battery life. The motor may stop automatically in any of the following cases (1), (2) and (3)
even if the switch is depressed continuously during operation. This is because the protective function is
activated. It is not faulty.
Protective
function
Overdischarge
(1)
protection circuit
Overload
(2)
protection circuit
Battery overheat
(3)
protection circuit
BCL 1015
Manual tightening mechanism
The Model DB 10DL is usable as a manual screwdriver. Power off the Model DB 10DL and use it as a
manual screwdriver by turning the main body. Also, when the battery power is out accidentaly, can use it as
a manual screwdriver.
Precautions for use of the Type BCL 1015 lithium-ion battery
Cause of trouble
Battery voltage is decreased to about 6 V.
Heavy-duty work
Continuous operation
or heavy-duty work
Charge the battery immediately
in such case.
Release the switch and eliminate
the cause of the overload problem.
Remove the battery from the tool
and cool it down.
UC 10SFL
-2-
Countermeasure