I would be very cautious with declared lifetime of non-existing things, all Equium (and seemingly the other player Blueheart, that state a much more conservativ

I would be very cautious with declared lifetime of non-existing things, all Equium (and seemingly the other player Blueheart, that state a much more conservative 15 years lifetime) have right now are laboratory prototypes. If you check the Blueheart "About" site here: https://www.blueheartenergy.com/ https://www.blueheartenergy.com/ they have nice pictures of the various prototypes and of the (supposedly final) product, you can appreciate at a glance how different they look, and it wouldn't be the first time that expected lifetime (estimated on prototypes) results vary for the industrialized product.