I have a 2015 MacBook Air, 8/256. I need to replace the battery; it shuts down from lack of power after about two hours of being unplugged. It cannot be upgraded past the Monterey operating system. Still has adequate storage left (roughly half full). Does everything I want it to and more. Shipping it to Apple for a new battery will cost $160 (circumstances do not allow me to drive to the Apple Store). Been considering the new M2; looked at them at the Apple Store. The more I think about it, the more I think I will replace my 2015's battery. Bad decision?