The LXNAV S3 UPS battery pack is specially designed as a backup supply for the S3 variometer.
The UPS would be installed permanently behind your instrument panel and would be inserted in-line between your S3 vario and your power source. Should your power source ever fail the UPS would then give you a full 10 hours' useage to get you safely home.
The UPS can also be connected to an S3 rear seat repeater in a two-seat glider, and would provide both varios with power, but for less time.
Connects using a standard RJ12 to RJ12 cable.