1720
It's official: Smartphones will need to have replaceable batteries by 2027
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
It's so dumb that a standard hasn't been developed yet. Like AA/C/D, 18650 batteries, etc. They could have modular batteries with different sizes and capacities that work interchangeably.
BL-5C is becoming a de facto standard size for random electronics, but it's too small for a smartphone.
It took forty years for aa batteries to become a standard. They were a trademark type by I think everready.