No mechanical vario for me.

I have 2 separate battery circuits (tail & main, both supported by solar) and the LXNav S10/100 has an internal battery backup for all functions (up to 4 hours).

I felt like a mechanical vario was a waste of panel as a total power loss results no audio vario or navigation (or logging). I also use a nano for a logger backup. And of course mechanical varios require a bottle (PITA).

Sean