M1 MacBook Air vs M2 vs M3: M1 still wins on battery life, but the gap is tiny.

The M1 Air is a freak of efficiency, outlasting most Windows laptops even in 2020. The M2 drops maybe 30-60 minutes due to its larger screen, while the M3 ties the M1 at about 15 hours. Real-world use (web browsing, email) gives 12-15 hours for all three, so battery life isn’t a deciding factor.