Discussion around the battery life of the A9 chip started after users running benchmarks found that the TSMC chip was lasting almost two hours longer than the Samsung made chip. Apple responded to reports by claiming that the difference in real world usage was just 2-3%.
Ars compared the difference in Wi-Fi browsing, WebGL, Geekbench 3, and GFXBench tests and found that the Samsung did have consistently lower battery life results, except in the WebGL test in which it barely edged out the TSMC.
The Geekbench test was the only test that caused what we would believe to be a statistically significant difference, one that we can definitely attribute to the SoC rather than the screen or the battery itself or some other system component. All three of the other tests showed the two phones scoring within two to three percent of each other, which just happens to be the same figure Apple quoted to the press last week. The heavier Geekbench test, on the other hand, showed the TSMC phone lasting an average of 28 percent longer than the Samsung phone.
While there are definitely situations where the TSMC chip does better than the Samsung, Ars believes that battery life should in general be similar no matter which chip you use.
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