4
5
While the 1S 3.7V DC Lithium Polymer Battery Charger
(PKZ3240) included with your J-3 Cub has been
specifically designed to safely charge the included 1S
3.7V 120mAh 14C Li-Po Battery (PKZ1035), you MUST
read the following safety instructions and warnings before
handling, charging or using the Li-Po battery.
Note: Li-Po batteries are significantly more volatile
than the alkaline, Ni-Cd or Ni-MH batteries used in RC
applications. All instructions and warnings must be
followed exactly. Mishandling of Li-Po batteries can
result in fire.
By handling, charging or using the included Li-Po battery
you assume all risks associated with lithium batteries.
If you do not agree with these conditions, return your
complete J-3 Cub model in new, unused condition to the
place of purchase immediately.
• You must charge the included 1S 3.7V 120mAh 14C Li-Po
battery in a safe area away from flammable materials.
• Never charge the battery unattended. When charging the
battery you should always remain in constant observation
to monitor the charging process and react to potential
problems that may occur.
• After flight, the battery must be cooled to ambient
temperature before charging.
• You MUST use the included 1S 3.7V DC Li-Po Battery
Charger (PKZ3240). Failure to do so may result in
a fire causing personal injury and/or property
damage. You can use the E-flite Celectra 4-Port
Charger (EFLC1004) to safely charge the 3.7V
battery pack as well. DO NOT use an Ni-Cd or
Ni-MH charger.
• If at any time during the charge or discharge process
the battery begins to balloon or swell, discontinue
charging or discharging immediately. Quickly and
safely disconnect the battery, then place it in a safe,
open area away from flammable materials to
observe it for at least 15 minutes. Continuing to
charge or discharge a battery that has begun to
balloon or swell can result in a fire. A battery that
has ballooned or swollen even a small amount must
be removed from service completely.
• Store the battery at room temperature in a dry area for
best results.
• When transporting or temporarily storing the battery,
the temperature range should be from 40–120 degrees
Fahrenheit. Do not store the battery or model in a car or
direct sunlight whenever possible. If stored in a hot car, the
battery can be damaged or even catch fire.
• Do not over-discharge the Li-Po flight battery.
Discharging the battery too low can cause damage
to the battery resulting in reduced power, duration or
failure of the battery entirely. (See below for details.)
Li-Po cells should not be discharged to below 3V each
under load. In the case of the 1S Li-Po battery used for
the J-3 Cub, you will not want to allow the battery to fall to
below 3V during flight.
The J-3 Cub receiver unit features a soft low voltage
cutoff (LVC) that occurs when the battery reaches 3V
under load. When the soft cutoff occurs, the ESCs of the
receiver unit will reduce power to the motor (regardless
of the power level you have set with the throttle stick) in
order to prevent the voltage of the battery from dropping
below 3V. This reduction in power usually requires that
you land the model immediately, at which point you should
power down the model and unplug the flight battery. While
it is possible to power the model up and to fly again after
the soft LVC occurs, this is NOT recommended as this will
over-discharge the battery. Continued discharging to the
soft LVC will cause permanent damage to the Li-Po
battery that results in lost power and duration when using
the battery for subsequent flights, or failure of the
battery entirely. Continued attempts to further discharge
Battery Warnings and Guidelines
