The base iPhone 13 is rated to last about 2.5 hours longer than the iPhone 12 did, and the 13 Pro and Pro Max are even Low Power Mode will extend the battery life on your phone significantly
The iPhone 12 Pro battery life is 2.5 hours shorter over 5G than 4G; And even if you spring for a 30-watt charger, the iPhone 12 Pro will max out at 14W. iPhone 12 Pro vs Samsung Galaxy S21.

Shows 49% longer battery life (35:23 vs 23:41 hours) Better camera quality (According to DxOMark rating) Apple releases software updates and supports their phones a few years longer than Samsung. Thinner bezels – 5.3% more screen real estate. 16% faster in single-core GeekBench 6 test: 1975 and 1702 points. Evaluation of Samsung Galaxy Z Flip

I updated my 12 Pro to iOS 15 and the battery performance was unchanged. Then I updated to iOS 15.0.1 and it still sucked until I let the battery completely drain to zero and then charged the phone back to 100%. The following night I put it in airplane mode and the battery stayed at 100% for 8 hours.
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24/7 automated phone system: call *611 from your mobile. Here's info on the battery specs (e.g., Usage Time, Standby Time, etc.) for your iPhone 12 Pro / iPhone 12 Pro Max. For fast charging the iPhone 11 the recommended power source is the 13 watt adapter, and for the iPhone 12 and 13 Apple recommends the 20 watt adapter for the fastest charging. However, you can use a higher power adapter safely; the phone will only take the power it needs. Thus, if you have a 61 watt MacBook adapter it is safe to use that.

The Plus also has better battery life. The iPhone 15 Pro and iPhone 15 Pro Max support the USB 3.0 standard and are Apple hasn't offered a charging brick in the box since the iPhone 12, so

Your iPhone 12 Pro Max is most likely indexing data in the background. It happens every time you restore an iCloud backup from a previous iPhone. It’ll take a few days to settle things in. Then you’ll see the true battery life of the phone.

The iPhone 12 is powered by a 2,815 mAh battery and the iPhone 14 Pro Max is powered by a 4,323 mAh battery. These battery capacities allow for up to 17 hours of video playback time or up to 65 hours of audio playback time on the iPhone 12, and up to 29 hours of video playback time or up to 95 hours of audio playback time on the iPhone 14 Pro Max.

The iPhone 12 Pro Max is the biggest, most equipped, and most expensive iPhone you can buy this year. It has a larger screen, larger battery, and larger main camera sensor compared to the other
Modern USB Type-C port. Shows 17% longer battery life (41:22 vs 35:23 hours) Better camera quality (According to DxOMark rating) Newer Bluetooth version (v5.3) The phone is 2-years and 11-months newer. 29% better performance in AnTuTu Benchmark (1488K versus 1151K) Uses a faster type of memory: LPDDR5 3200 MHz. .
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