So far I have had one battery short and one switch go bad in the air. I also had one switch so full of dirt it made the plane control surfaces start jerking around so the problem was caught on the ground. Changing switches with every new battery?? First time I have ever heard anyone do that but I can understand the thinking. I gave up using the cute little switches that come with flight packs years ago and went over to the JR heavy duty switch. It was one of these that I managed to pack full of dry lake fauna. By using electrical cleaner, the spray, it started to work again but for the price I cut the wires off and trashed it. I use the wire leads to make up extensions, waste not!!!