After a long trip towing my glider I was going thru the cockpit and on the floor I discovered a Lithium battery in a black plastic holder on the floor near the instrument panel, (I hate when that happens).

The battery is about th same size as a AA and i have no idea where is came from or goes. No sign of any breakage with the plastic holder. All instruments, radio and warning devices are working.

Any ideas?

HGXC