[Watch_Geekmaster]

Your second from left, the HDD-S100 is using a capacitor to store the energy and only have 14 days power reserve. Theoretically, the capacitor should be very long lasting. But once it fails, so is the whole watch. As for Casio watches with a solar rechargeable battery, they have a lot long power reserve (months) and usually also last a very long time if well maintained. There are members here who mentioned their solar watches last more than 20 years. The problem is usually when people completely drained their rechargeable battery (e.g. by leaving the watch in a dark drawer for years) and permanently degrading its performance.

Nice collection by the way! I didn't know the HDD-S100's so big, until I see the comparison in your pic.