How to change the battery in your Micro Mosquito or Firefly RC Helicopter

The Micro Mosquito and Firefly RC helicopters by Interactive Toy Concepts both use a single cell 200mAh Lipo battery. This battery is good for hundreds of uses, but if you ever find that you need to replace yours please follow these instructions:

1. Remove the small motor pinion gears by prying them off with a thin screwdriver. (read this article if you have trouble)
2. Remove the retainer on the bottom main shaft. The tab will pull off sideways.
3. Remove the rotor assembly (rotors, shaft & gears) as one piece, either by pulling on the top of the main shaft or by pushing the bottom of the main shaft up through the body.
4. Remove all 7 screws on the bottom of the Micro Mosquito or Firefly body.
5. Remove the 4 motor screws on the top.
6. Gently separate the upper and lower body halves until you can see screw which holds the circuit board to the upper body half. The screw is located on the inside near the front left leg. Remove this screw.
7. Pull the battery up to release it from the adhesive tape, and locate the red and black wires. Unsolder the old battery and remove. Set the new battery in place and solder its wires, ensuring that the polarity is correct. The red wire is positive and the black wire is negative. Do not allow the battery wires to short to each other, or allow the wires to touch any point on the circuit board except the battery contact points (labeled B+ and B-).
8. Replace the screw that holds the circuit board to the upper body half.
9. Align and join the upper and lower body halves, ensuring that none of the internal wires are pinched.
10. Replace the 4 motor screws.
11. Replace the 7 screw that hold the body halves together.
12. Install the rotor assembly, sliding the bottom of the shaft through the hole in the center.
13. Clip the retainer onto the bottom of the main shaft where it exits the bottom of the body.
14. Replace the small motor pinion gears. The pinion with the flat cap should be installed on the right hand motor with the flat cap facing up. The other pinion should be installed on the left hand motor with the stem facing up. The pinion on the right side should mesh with the upper large gear, and the pinion on the left side should mesh with the lower large gear.

The battery replacement is now complete.

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