iPhone randomly shuts down and immediate battery drain
If your charge cycles are also above 500 then it's time to start considering a new battery . Definitely check if your battery could be swelling up by inspecting if the screen is still flush with the frame. Additionally, you can check for panic logs but if there aren't any, chances are it's your battery that needs to be replaced.
Manually shutting down the iphone while its on. (The forced shutdown occurs too quickly.) Holding the shutdown button while the iphone is shutdown , then charging after . Trying 2 different cords and a wireless charging station. Keeping the iphone plugged-in after the first forced shutdown . Attempt to drain the battery overnight.

iPhone randomly shuts off, full battery t
iPhone shuts down with battery still high? Fix it with cooling, force restart, iOS updates, Battery Health checks, and Recovery/DFU restores.

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Understanding Iphone Shuts Down After Setup Due To Battery Drain Before the Gallery
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