Hi everyone, John I don't really think the TX battery has to be changed out, I used to fly 3 planes RX's dry and still have to leave the TX on for hours after I got home to cycle it down. Are the more modern TX's harder on batteries? I only have 8 or 9 flights on my FASST radio and it seems to have the same characteristics as my old super seven. Just my two cents worth.Calvi.