None of us have any data. Just life experience that tells us newer technology improves significantly in the first couple decades after introduction. That is the only basis I have. In my basement storage I have a 40” plasma TV from 2001 that weighs like 80lbs, and cost $2000 and lost a lot of pixels after 4 years. Things got a lot better since.It’s me who is being disingenuous, not the people who are claiming these batteries will last for 10 years with absolutely not data to back that up, nor the company that, for whatever reason, refuses to warranty them for that length of time? Mmmmmkay.