...it's the battery of my FOB key: I bought a spare one as soon as I got the car, but the original one is been working for five years so far, and still it's as powerful as when it was new.
On the open air I can open the doors from 30 meters (the owner's manual says the maximum distance is 15 meters) and in the underground parking lots from much, much afar. It works from that afar, that with a normal walk it takes to me more than the 30 seconds of time-out to reach my car. Daewoo (GM) electronics kick ass indeed. I sure hope that my spare battery will still be good, when I need it.