[bubblethink]

You can implement genuineness checks for equipment without requiring a stooge to install the equipment for you. The car industry does it, and cars are much more likely to kill you. Other electronics with batteries do it too. Nothing about a phone is unique. Again, this is mostly a problem of education. If it takes me 5 comments on HN to explain that you are capabale of replacing a battery, it's a lost cause.

[vile_wretch]

You're far less likely to find a cheap counterfeit aftermarket battery than you would Kirkland or Bosch or something, which comes with way more assurance than a random no-name lithium ion battery that has been hacked to appear new and healthy and which is capable of exploding while firmly placed near your waist.

[ChickeNES]

It's literally cheaper to pay Apple to replace an iPhone XR battery than it is to buy a trustworthy replacement from iFixit, and a modest (~$25 at worst, though I'm not including shipping cost from iFixit, and labor would eat most of that margin IMO) premium for phones dating back to the iPhone 6.