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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 Samsung S5 has an IP67 rating and the battery on that was easy to replace.
If you drop either phone they are probably just as likely to be compromised.
I could see a latch that you need the sim ejector to open. Something that still very secure, but possible for an user user to replace with out the need of a freaking heat gun. While still keeping the design.