Bought an M4 11" 3 months back. Very happy with the battery life. Use it extensively. Think it will last a long time.I don’t have a M4 IPad Pro yet, but I was planning to buy one when the M5 was released.
But when I see all these scary numbers of people having 90% battery health just after 200-250 cycles, I think I pass😅
Currently using a 11” Pro from 2020 and I have 470 cycles and 90% battery health according to the app imazing.