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Battery Warnings and Guidelines
While the 7.4V 800mAh 2-cell Lithium Polymer Battery Pack (EFLB0990) included with your
Blade CX3 MD 520N features Charge Protection Circuitry and Balance Charging via the included
2- to 3-Cell Lithium Polymer Balancing Charger (EFLC3110) to help ensure a safe charge every
time, you MUST read the following safety instructions and warnings before handling, charging or
using the Li-Po battery pack.
Note: Lithium Polymer 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 Blade CX3 MD 520N model in
new, unused condition to the place of purchase immediately.
• You must charge the included 7.4V 800mAh 2-cell Li-Po battery pack in a safe area away from flammable
materials .
• Do not charge the battery when installed in the helicopter.
• 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 2-3 Cell 7.4-11.1V Li-Po Balancing Charger ONLY.
Failure to do so may
result in a fire causing personal injury and/or property damage .
DO NOT use a 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.
• In the event of a crash, you must quickly and safely disconnect and remove the battery from the model, then
place it in a safe, open area away from flammable materials to observe it for at least 15 minutes .
• Store the battery at room temperature and approximately ½ charge (3.8V per cell; 7.6V for a 2-cell battery pack)
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 cause a fire .
• Do not over-discharge the battery. Discharging the battery too low can cause damage to the pack
resulting in reduced performance and duration.
Li-Po cells should not be discharged to below 3V each under load. In the case of the 2-Cell
Li-Po packs used for the Blade CX3 MD 520N, you will not want to allow the battery to fall
below 6V during flight.
The Blade CX3 MD 520N 3-in-1 control unit does not feature a voltage cutoff of any type, so we
suggest that you be extremely aware of the power level of the Li-Po battery pack during flight. If at
any time the helicopter begins to require more throttle than typical to maintain hover or flight, or
has lost significant power, you must land the helicopter and power the motors down IMMEDIATELY to
prevent over-discharge of the Li-Po battery pack. If you continue to run the motors after noticing a
loss in power, it is possible to discharge the Li-Po battery pack too far, causing permanent damage to
the pack.
Over-discharge of the Li-Po battery pack can result in shortened flight times, loss of power output or
failure of the pack entirely.
If you have any further questions or concerns regarding the handling, charging and/or use of the included Li-Po
battery pack, please contact the Horizon Support Team at 877-504-0233 .
