A watch battery or button cell is a small single cell battery shaped as a squat cylinder typically 5 to 12 mm in diameter and 1 to 6 mm high--like a button on a garment, hence the name.
VARTA AG (Vertrieb, Aufladung, Reparatur Transportabler Akkumulatoren; Distribution, charging, repair of transportable accumulators) was a company based in Germany manufacturing batteries for global automotive, industrial and consumer markets. A sales slogan was "you're smarter to fit Varta!
German manufacturer of batteries which, along with Bosch, Wilhelm Hagen, Moss and others, came in new VWs.
Changin battery
This shot was taken for Varta Romania contest. It was a little hard for me because is the first time when I added a little "robot detail" from my hand.