For those of you who may be interested in the Citizen Eco-Drive system;
Citizen Eco-Drive watches use the simplest, yet most technically advanced power generating and storage system in the Watch Manufacturing Industry. A Solar conversion panel and energy cell (battery) are the power provider for these Quartz Watches. Eco-Drive's ability to use light from any source to generate electrical power means that the supply is limitless and free. The absence of any added complex power generating machinery that would require additional upkeep is another big advantage.
My Skyhawk works very well. The Battery charge indicator has never moved off “full” which equals six months of charge. The charge indicator is not fitted to the smaller units, but the system works the same.
Rod1