Official documentation

Use Low Power Mode on your iPhone

Apple Support, 2026

Read on October 17, 2026

What it is: Apple's support article on Low Power Mode for iPhone. It lists the features the mode limits, and it describes how the mode turns on and off.
How much weight it carries: Official Apple documentation. The list states what the mode changes but does not claim to be exhaustive, so a feature missing from the list is a reason to test, not a guarantee.

Facts taken from this source

Apple's list of the features Low Power Mode limits includes email fetch, background app refresh and automatic downloads, and does not include Dictation.
“Low Power Mode reduces power usage by limiting certain features: Keeps 5G on for streaming and large downloads (iPhone 12 and 13 only) Sets Auto-Lock to 30 seconds Reduces display brightness Turns off some visual effects Pauses iCloud Photos temporarily Turns off automatic downloads Turns off email fetch Turns off Background App Refresh” (Section on what Low Power Mode does)