1650
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.
The EU almost forced the phone industry to start using standardised/interchangeable batteries.
If the batteries cost as much as a new phone, they'll reconsider that decision.
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.
From what I got from the article posted a few days ago, I believe it is by large a sustainability/climate effort, targeting all kinds of industry machinery batteries as well as phones. There is likely a bonus for end user usability, but that is relatively incidental.