This is entirely false for most modern phones
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Except it's not.
https://security.stackexchange.com/questions/65382/is-it-pos...
Do you have a vested interest in the matter?
I've opened many phones and have one open in front of me. I have schematics of a few open too. Some have supercaps for RTC. No extra batteries.
Show me a picture on a teardown on ifixit with this in a nexus phone?
Or in an iPhone?
No? Yeah...