Review: Apple's next-gen MacBook Pro with 15" Retina display
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Apple says the new MacBook Pro gets up to 7 hours of wireless Web browsing, while with the lid closed in sleep mode, it offers up to 30 days of standby time, with its built-in 95-watt-hour lithium polymer battery.
For our own battery test, we looped 1080p high-definition video through iTunes on the machine in fullscreen mode with Wi-Fi enabled and connected, brightness at the default setting, and no other applications running in the background. Under this scenario, we achieved battery life of about 6 hours and 15 minutes.
In this test, the machine ran quietly and its internal fans never engaged to run the high-definition movies. Remaining cool and silent, the MacBook Pro performed well in the battery stress test, and the numbers suggest that Apple's own estimate of 7 hours of less-strenuous Web browsing is probably accurate.
It's also worth noting that the new MacBook Pro also has a new, thinner MagSafe 2 power port, which means users with devices like a Thunderbolt display will need to buy an adapter to allow compatibility with older MagSafe accessories. With the new MagSafe 2 port, the power cable sticks out of the MacBook Pro at a right angle, rather than the previous design that was flush with the machine. We found this design change to be a minor annoyance.