RE: Howard Engineering - Kwik Fli III – Build
I received the correct batteries from Batteries America. If you are not experienced with electronics work and soldering don’t attempt this battery change. The transmitter can be easily damaged and the batteries can put out some amazing current if shorted. Needless to say if you reverse the red and black wires you will fry the transmitter.
The Kraft Series 77 transmitter uses two airborne backs wired in series. The transmitter has four screws on the side to remove the back and four screws on the bottom to hold the battery case. The battery case can be slid out on one side and the circuit board mount clamp removed by removing the retain screw. The last time I changed the batteries I used lose fitting heat shrink to cover the solder joins so I was able to just slide them back to make the new connections. After the packs are installed, reinstall the printed circuit board and slide the battery case back in place. There are a couple of wire bundles that need to be moved so they are on top of the case and not caught between the front of the case and the battery case. Replace the four screws on the battery case.
I always put a tag on the battery case with the install date and the mAh rating. Replace the back cover, charge the batteries and test the operation.
To be continued….