Fifteen months ago I bought a Kurt Kinetic wireless bike computer to use with my bike on the trainer.
The battery went dead last week so I replaced it as well as the batteries in the heart rate monitor and the Speed/Distance transmitter.
The computer quit after just 19 kilometers. All the numbers and text show up properly, but the speed and distance remain at Zero. I've fiddled with the Speed/Distance transmitter and the magnet on the spoke. No change.