after almost 2 years, my wahoo cadence sensor is down to 15 percent, as reported by trainerroad. It still seems to work just fine. The heart sensor seems to go through batteries much faster. But even then, I'm not sure that a rechargeable battery is the way to go

I looked up how to change the battery on the cadence sensor, since it looks to be sealed. Requires prying open the case, which is not ideal. OTOH, having a door might not be any better