Yes if it hits 79%, you can swap it under AppleCare+ at the Apple Store. My MBP M1 Max is on the second replacement and still great!
I use Al Dente to further optimize battery and calibrate it now and then
I use Al Dente to further optimize battery and calibrate it now and then
I didn't have a spare laptop to work with at that time for a week so i held of[1]. This is probably a reason for lot of people opting out of upgrades.
After the M4 came there was hype for the new screen which performs better in sunlight and M1->M4 seemed worth it plus vRAM which is certainly handy.
[1]The screen was also deteriorating - no physical issues just wasn't as bright as it was new) and they said I should replace that too. The economics a new Air worth of money on a older laptop with just 1-2 years primary use life left is shaky.
Also both times I did it, it took 2-3 days, not the quoted 1+ weeks