http://www.craggyaero.com/air_data_indicator.htm

Can also be used with LXNAV S3, and Air-Avionics Air Control display Altimeter.

Craggy Aero S3/ADI Backup Battery Pack Holds 8 AA batteries ON-OFF Panel switch will power the V3/ADI for approx 15 hrs.

Switch has 2 positions Main Glider battery, Backup battery.

Richard
www.craggyaero.com