If you don't mind glossy screens and crappy keyboards and lack of ports, М1 Airs are your best bet if you are after cheap and good battery life: haven't tried i

If you don't mind glossy screens and crappy keyboards and lack of ports, М1 Airs are your best bet if you are after cheap and good battery life: haven't tried it yet with Asahi Linux, simply because I do my Linux stuff on X1 Carbons (though they are getting worse by the generation).