I just replaced my 10(!) year old 15" MBP with a new 16" (M3, but I needed it at the time, and the difference between M3 and M4 is not enough to worry me). It'

I just replaced my 10(!) year old 15" MBP with a new 16" (M3, but I needed it at the time, and the difference between M3 and M4 is not enough to worry me). It's almost exactly the same size and weight, I prefer the shape of the old MBP, but the new one is perfectly fine. However, the old one had replacement SSD and was on its second replacement battery, not sure I can do that with the new one.