Panasonic EY4541 Operating Instructions Manual page 17

• If the tool is used in cold-temperature
conditions (such as during winter) or if
it is frequently stopped during use, the
overheating protection feature may not
activate.
• The performance of the EY9L42 dete-
riorates significantly at and below
10°C due to work conditions and other
factors.
• The ambient temperature range is be-
tween 0°C (32°F) and 40°C (104°F).
If the battery pack is used when the bat-
tery 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.
(3) Battery low warning lamp
Off Flashing
(normal (No charge)
operation) Battery protection
feature active
Excessive (complete) discharging of
lithium ion batteries shortens their
service life dramatically. The tool in-
cludes a battery protection feature
designed to prevent excessive dis-
charging of the battery pack.
• The battery protection feature acti-
vates immediately 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 in-
dicates 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 overdischarge preven-
tion 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.
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