The disadvantage of a conventional battery Frogman compared to a Tough Solar Frogman is that you need to change the batteries from time to time. I changed the battery in January 2015 myself. The CR2016 clearly didn't last 9 years. Above is the proof of exchange of battery in August 2005, €8,- including waterproof test.
Above and below are two pics I found on an Auction of a worn Carbon Frogman. You can clearly see the print come off, specially in the second pic. This happens of course after longer daily use.