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Control Panel
(1)
(2)
(1) Overheat warning lamp
Off
(normal
operation)
Flashing: Overheat
Indicates operation has
been halted due to battery
overheating.
The overheating protection feature halts tool
operation to protect the battery pack in the event
of overheating. The overheat warning lamp on the
control panel flashes when this feature is active.
• If the overheating protection feature activates,
allow the tool to cool thoroughly (at least 30
minutes). The tool is ready for use when the
overheat warning lamp goes out.
• Avoid using the tool in a way that causes the
overheating protection feature to activate
repeatedly.
• If the tool is used in cold-temperature condi-
tions (such as during winter) or if it is frequently
stopped during use, the overheating protection
feature may not activate.
The performance of the EY9L42 de-teriorates
significantly at and below 10 °C due to work
conditions and other factors.
• The ambient temperature range is between
0 °C (32 °F) and 40 °C (104 °F).
If the battery pack is used when the battery
temperature is below 0 °C (32 °F), the tool may
fail to function properly.
• When charging a cool battery pack (below 0 °C
(32 °F)) in a warm place, leave the battery
pack at the place and wait for more than one
hour to warm up the battery to the level of the
ambient temperature.
(2) Battery low warning lamp
Off
(normal
operation)
Flashing
(No charge)
Battery protection
feature active
Excessive (complete) discharging of lithium ion
batteries shortens their service life dramatically.
The tool includes a battery protection feature
designed to prevent excessive discharging of
the battery pack.
• The battery protection feature activates imme-
diately before the battery loses its charge,
causing the battery low warning lamp to flash.
• If you notice the battery low warning lamp
flashing, charge the battery pack immediately.
• If it is started with too little battery power
remaining, the tool may stop operating without
the battery low warning lamp flashing first. This
indicates that there is too little battery power
remaining to use the tool, and the battery pack
should be charged before further use.
• If the tool is subject to a sudden load during
use that causes the motor to lock up, the over-
discharge prevention sensor may be triggered,
and the battery low warning lamp may flash.
The lamp will stop flashing once you address
the cause of the motor’s locking up and cycle
the trigger.
CAUTION:
The over-discharge protection function works
even when both the battery low warning lamp
and LED light are flashing.
• Charge the battery pack immediately as the
battery power is getting low.
• When charging a cool battery pack (below
0 °C (32 °F)) in a warm place, leave the battery
pack at the place and wait for more than one
hour to warm up the battery to the level of the
ambient temperature.
• Weaken and cut off the power applied as the
voltage of the battery is plummeting due to the
high load acting on the motor. Do not carry out
operations that will repeatedly cause the over-
discharge prevention function to be activated.
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