The battery in the M4 MacBook Pro is bigger at 72.4-watt hours; the M3 MacBook Pro had a 70-watt-hour battery. The M3 model had “Up to 22 hours Apple TV app movie playback” and “Up to 15 hours wireless web” while the M4 model is stated as 24 and 16 hours respectively.

With the MacBook Pro 14-inch M4, Apple has created a pro-grade portable that impresses in every respect. It joins Apple's pantheon of outstanding laptops, and is set to take a well-deserved place at or near the top of our best laptops rankings.

The High Power Mode on Macs with Apple’s M4 Pro and M-series Max chips appears to start that cooling process proactively, which is why Cunningham observed more fan noise without any change in performance. If you want to get top performance out of a chip like the M4 Pro for as long as possible, it’s best to keep it cool from the very start.