Dash M50 with powertap pedals connected via ant.
When the powertap battery level gets low there should be a warning popup alert displayed on the dash (like Garmin does).
I know that I can manually check the power meter battery level but that needs a dozen keypresses and needs me to remember to do it. Far better to warn me when I need to deal with the power meter battery. Without an alert it's too easy to set off and find the pm dies a short way into the ride so there's no power data for the ride.
I have powertap pedal power meter but I assume the behaviour would apply for all power meters.