I&#x27;ve got a 15&quot; rMBP and regularly get 8-10 hours of browsing, word processing, or light coding. On ArsTechnica&#x27;s web browsing battery test, the rMBP exceeds 10 hours.<p>Recommended display brightness for standard office conditions is 150 nits. The rMBP goes up to double that, which obviously has a battery life cost. Also Chrome is poorly optimized for Mav, it takes several hours off the total.