Unsurprisingly, they died in the order they were released: The iPhone 6 Plus' battery died first, followed by the iPhone 6s Plus; the iPhone 7 Plus lasted the longest. To perform the test, TechRadar set the brightness on each phone at the highest level, connected them all to the same Wi-Fi network, turned on Bluetooth and ran a website script to simulate web browsing for two hours.
Then they played the game Real Racing 3 until each phone died. In the end, the iPhone 6 Plus' battery lasted 3 hours and 34 minutes, the 6s Plus lasted 3 hours and 54 minutes and the 7 Plus lasted 4 hours and 15 minutes. Of course, these numbers aren't really reflective of the phone's battery life under normal use. It will last a lot longer than 4 hours and 15 minutes if you're using your phone wisely.
Wear level is the battery's capacity to hold a charge compared to its capacity when brand new. For example, an iPhone X comes with a battery (the X actually has two batteries inside) with a total capacity of 2,716 milliamps per hour (mAh); according to the Battery Life app, it still has that full capacity. However, the iPhone 6s Plus has a battery that was originally capable of 2,725 mAh, but now can only hold 2,300 mAh, or 84 percent of what it once could handle.
The more you check this app, the more history it keeps, so you can check to see as your iPhone battery capacity decreases over time. That happens after more and more charge cycles are used. A charge cycle happens every time you discharge 100 percent of a battery's capacity. Apple says its batteries are good for 400 to 500 charge cycles.
That usually takes a year or two—or around the time you'd upgrade iOS and see it all slow down when the new iOS detects an aging battery and reduces processor output to "help" you. It doesn't hurt that Apple would also prefer you purchase a new phone around that time, too.
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