I have newish (June 20) PSIMET Pro+ wheel with a Garmin 500 head. I have about 150 hours on the hub right now. Today, after about 2.5 hours of riding where everything was normal (even set a new 5 min peak), the power numbers went way down, to single digits. There was some response to trying to raise the power, but everything seemed low. What I felt was about 100w was 25, 200w was 100, etc. Normal light pedaling was zero, which I never saw before. It was always sensitive to the lightest pedaling. Is this consistent with a battery going away? The online PowerTap manual says "400 hours", but is that other people's experience?
And the recording shows the cadence (no sensor, just from the PT) dropping to zero a lot, like I was coasting.