I've been plagued with poor battery life for 6 months or more. Getting 1-2h screen time and often dead by 5pm on an iPhone 13 Mini with 82% battery health. I even got the battery replaced. Tried everything I should think of: low power mode 24x7, no 5g, no complications, no background updates, watch disconnected, no location services.
The four models -- a base iPhone 13, a 13 Mini, a 13 Pro and a 13 Pro Max-- feature changes like a smaller notch, better battery life and new camera tricks. (Here's how to preorder the iPhone 13 .)

As my secondary device, the iPhone 13 Mini happily reserves its battery for up to 2 days on standby. On those busy weekends of meeting friends and family, a full morning charge lets the iPhone 13 Mini make it through a day with moderate to heavy use (photography, streaming music, taking calls, watching photos, etc).

The iPhone 13 and iPhone 13 mini iterate upon the successful iPhone 12 with new cameras and longer battery life. The notch has been reduced in size, and the rear camera module now sits at a diagonal.
Usually have mid 30s % battery left at the end of the day. Only charging is on an aftermarket magsafe pad over night each night. Weekends in good cell coverage at home, can easily get 6h SoT (though rarely use the phone that much) over maybe 16h off charger. Battery health currently at 93%.

The 13 mini battery has been great for me. I get about 8 hours of YouTube, Twitter, Reddit, Discord, and other miscellaneous tasks before hitting 20%. It’s similar battery life to my iPhone 12 which I thought had a great battery life.

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battery life of iphone 13 mini