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The Blade mCX Tandem Rescue’s 5-in-1 control 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 5-in-1 unit will reduce power
to the motors (regardless of the power level you have set with the throttle
stick), and the RED LED will blink 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.
Though it is possible to power the model up and to fly again after the
soft LVC occurs, this is NOT recommended. 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 motors are 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/
helicopter throughout the flight. If at any time the helicopter begins to
require more throttle than typical to maintain hover or flight, you should
land the helicopter immediately. Routinely discharging the battery to the
soft LVC can still cause permanent damage to the battery.
Note: When the battery power/voltage is getting low you will typically find
that significant rudder trim and/or rudder stick adjustments are
needed to prevent the helicopter from spinning. This usually occurs
before soft LVC, and indicates a good time to stop flying.
If you have any further questions or concerns regarding the handling, charging and/
or use of the included Li-Po battery pack, please contact Horizon Support Team at
877-504-0233, Horizon Hobby UK at +44 (0) 1279 641 097 or Horizon Technischer
Service, Germany at +49 4121 46199 66.
Battery Charging
Celectra 1-Cell 3.7V Variable Rate DC Li-Po Charger Instructions
Step 1: Connect power supply to an appropriate power source.
Step 2: Insert output plug from power supply into the power input slot of the
Variable Rate Charger.
Step 3: Select the appropriate charge current for your battery by pushing the +
or - which are the smaller buttons to the right and left of the middle button.
(When charging your 250mAh battery, set the charger to 0.7 amps)
Step 4: Properly connect battery to the Charger lead. Match the red dots on both
the battery and charger connectors. (Please see image below)
Step 5: Press the start button on the Variable rate charger (the largest button in the
middle).
LED functions under normal operation:
• SINGLE SOLID LED – Shows Charge Current
• SINGLE LED FLASHING – Charging
• MULTIPLE LEDs FLASHING – Charge Almost Complete
• LEDs SWEEPING SIDE TO SIDE – Charge Complete
Note:
We do not recommend charging your single-cell Li-Po battery over 3C
charge rate. For example:
DO NOT CHARGE 110mAh battery packs
over .3 amps.
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