The review specialists at AnandTech reviewed the battery life of each iPhone model from the last few years. They based their comparison on the amount of time a phone would be able to leverage a full charge when on WiFi. Their results are below: iPhone 11 Pro Max – 15.58 hours; iPhone 11 – 14.03 hours; iPhone XR – 12.95 hours; iPhone 8

Tesserax wrote: Apple considers that an iPhone's battery needs to be replaced if it cannot maintain, at least, an 80% charge after 500 full recharging cycles. If this be the case for you, you should have it replaced by your local Apple Store or Apple Authorized Service Provider. Probably even before it reaches the number of nominal rated cycles.
1.5 hours longer battery life on iPhone 13 Pro than iPhone 12 Pro 2.5 hours longer battery life on iPhone 13 Pro Max than iPhone 12 Pro Max But keep reading below for more detailed battery life specs.
As the battery capacity of an iPhone 8 (not plus) is about 6900 mwh, if Bluetooth was the only thing using power the battery would run down in about 2800 hours, or about 3 months. Some Bluetooth devices require higher power; the most will be 10 mw, but that still means that if your battery life isn't what you think it should be, the problem is
How to check the maximum battery capacity. You can check the maximum battery capacity in the following way. “Settings” -> “Battery” -> “Battery health and charging” -> “Maximum capacity” In the case of the above image, the maximum capacity is 100% when new. summary. I have introduced how long the iPhone 8 can be used.
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how long does iphone 8 plus battery last