I do my own watch batteries (it's pennies once you buy a few simple tools from Amazon) and I have an Eco Drive watch as well (and a couple of automatic watches - watches are my weakness). The Eco Drive is 12 years old and it's fine. I've also got a Seiko Kinetic watch that's 18 years old and the capacitor on that works fine too. I think they definitely last longer than 10 years. Eco Drives seem to go on forever. Obviously YMMV.
Hope I haven’t caught one :/
Lot of fakes flying about on eBay
Thanks Andy wedge (y)
Thanks for posting @killie77 and a very belated welcome to hotukdeals (y)