The long pause time between page loads is what really makes this a light test. Flash is enabled and present on three of the sites. The light test hits four different websites every minute, pausing for nearly the entire time to simulate reading time. The light and medium suites are inherently related - they use the same workload and simply vary the aggressiveness of that workload. All battery life tests were run with the display calibrated to 200 nits. As always we have three individual tests, each simulating a different amount of load. To quantify battery life, I turned to our updated OS X battery life suite that I introduced earlier this year. Without the dGPU inside the system, the 13-inch rMBP does potentially have an advantage.
The 15-inch rMBP has an on-board discrete GPU that, when active, can significantly impact battery life.
CPU TDPs also go down by an identical 22% (45W down to 35W), but the comparison is more complex than that. With a 22% reduction in battery capacity, the question is whether or not the drop in power consumption will keep battery life balanced between the two systems. The smaller chassis forced the use of a smaller battery compared to the 95Wh part used in the 15-inch rMBP. The 13-inch rMBP features an integrated 74Wh, non-user-serviceable lithium polymer battery.
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