So, thanks to @The Cockney Rebel I paid a visit to my watch box, and organized them by size (largest to smallest).
After doing so, out of 10 or so mechanical watches, only two still have battery power.
Anyway, I have placed my AWU1 in the watchbox, and I am now wearing my Tissot. Tomorrow, if life spare, I will get a battery for my Diesel watch. If I continue to wear a mechanical watch for the next few weeks, I will consider batteries for the others...
Solar powered Rangeman for me. I also have some mechanical Seikos a Cocktail time and a Sumo
But feinding for an ultra2