At first the Kinetics had problems with their batteries. I have read that they improved but I think the technology is overly complex for the potential benefits. I feel somewhat the same way about the Citizen eco drives. I have owned several of them and my most recent one has battery problems. They say you can fully charge the battery, store it in a drawer for X number of day, and it will still be running. This is true when new but if you continually do this with an ecodrive the battery will die prematurely as mine did. These watches need fairly continuous light exposure. I have found that there are a lot of companies nationwide that exist just to repair ecodrives whose batteries died prematurely. My ecodrive battery lasted less than 5 years and it will cost me over $100 to have it repaired. My Luminox has a battery that will last over 5 years and I replace it myself for about $2. That is why I think the technology is overly complex and overly expensive and doesn't really gain you anything. Seiko makes a few models that are solar powered, I have not heard much about them.