We already know about a rumor that the Instinct 2 will sport solar assisted charging but the ultimate survival watch would be the one that you never have to charge.. So I watch this video about a watch that uses both solar charging and body heat to charge and it actually never needs to be plugged.. Looks like this watch has a ton of bugs and software problems but as it appears the power supply of this gps wrist hr watch works!
If this technology will ever be implemented in a next Fenix or Instinct it would be a revolution.. But I'm scared of what the price would be..