@jwz@mastodon.social Since models change over time I assume what you are really after is testimonies from say 2-3 years ago, but: I bought a Braun 720 in 2011 which I think I only replaced this year. (It's not impossible that I bought another Braun 7-series in between but I don't _think_ so.) I have always been pretty lazy about shaving so it wasn't being used every day. Its ability to hold a charge did decrease over the years but even at the end it wasn't at the point of "stops taking a charge". (The new one was bought too recently to be a candidate answer to your question, but FWIW its batteries show no obvious sign of degeneration after 6 months of, again, not-daily use. This one's a Philips i9000. I suspect its power button, which feels rather flimsy, will die before its batteries do.)