Since the unveiling of the HTC One series, the main complaint we have heard about the phones was HTC's decision to deliver devices with non-replaceable batteries. There are quite a few reasons why average users may want the ability to swap out a battery, but the main concern most people have centers around battery performance.
In the past, HTC has not had the best track record when it comes to battery life. HTC's dual-core flagship phones from 2011 were powerful and beautifully designed, but it was nearly impossible to make it more than 10 hours on a single charge. Fortunately, HTC listened to consumers and sent their engineers back to their labs to work on the issue.
Rather than equipping the HTC One phones with massive batteries, HTC's engineers researched every single layer of their phones to maximize power efficiencies between the chipset, networking, display, OS and application.
For the HTC One series our engineering teams spent thousands of man hours on the Battery Stamina Boost Project – an effort that impacts battery life by improving standby time, extending talk time, increasing audio and video entertainment time and increasing web browsing and social network time. When you combine this engineering effort, along with the 1800-mAh battery in the HTC One X, the real-world performance gains, as highlighted earlier, are significant.John StarkweatherHTC
The result? Compared to the HTC Sensation, the HTC One X features a larger 4.7-inch HD display and an 18% larger battery, but HTC managed to improve talk time by 147 percent, improve MP3 playback time by 105 percent, improve video playback by 39 percent and improve web browsing time by 23 percent. In order to back up its claims, HTC cites recent benchmark tests by AnandTech which proclaimed the AT&T HTC One X as the "longest lasting Android smartphone in our 3G web browsing test."
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