5
6
discharging the battery to the soft LVC can still cause permanent
damage to the battery.
If you have any further questions or concerns regarding the handling,
charging and/or use of the included Li-Po battery, please contact the Horizon
Support Team at 877-504-0233.
• 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.
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 P-51D, you will not want
to allow the battery to fall to below 3V during flight.
The P-51D receiver unit features a soft low voltage cutoff (LVC) that
occurs when the battery reaches 3V under load. When the soft cutoff
occurs, the ESC 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. And while it is possible to power the
model up and to fly again after the soft LVC occurs, this is NOT
recommended as 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 the
battery may also result in loss of control while the motor is running
as the voltage of the battery may drop below the minimum operating
voltage of the receiver and other electronics.
Also, it is not recommended that you fly to the soft LVC every time
you fly. Instead, you should be aware of the power level of the
battery/airplane throughout the flight, and if at any time the
airplane begins to require more throttle than typical to maintain
flight, you should land the airplane immediately. Routinely
Battery Charging
It is important that you only charge the included 1S 3.7V 120mAh 14C Li-Po
Battery (PKZ1035) with the included 1S 3.7V DC Li-Po Battery
Charger (PKZ3240) or the previously mentioned E-flite Celectra 4-port
Charger (EFLC1004). Attempting to charge the battery using another Li-Po
charger or non-Li-Po compatible charger could result in serious damage.
Please familiarize yourself thoroughly with the Battery Warnings and
Guidelines section before continuing. Please follow these steps to charge the
Li-Po battery with the included charger:
• Remove the cover on the bottom of the charger and install four of the
included AA batteries, noting proper polarity. Replace the cover after
the AA batteries are installed.
• Slide the battery into the slot on the charger. The end cap of the
battery has been specifically designed to allow the battery to be slid
into the slot easily one way (usually with the label on the battery facing
outward) to prevent reverse polarity connection. However, please be
sure to check for proper alignment and polarity before proceeding to
the next step.
• Gently press the battery and its connector into the charge jack/
connector located at the bottom of the slot in the charger. Again,
be sure to check for and to achieve proper polarity before making
the connection.
