Fortunately that [poor design] ship sailed years ago. User-removable batteries are flat stupid from a cell phone design engineering standpoint. There are reasons that iPhones dumped that idea long ago:User replaceable batteries in all iPhones, iPads, and MacBooks. A couple of screws to open a cover, disconnect a cable, a couple of screws to remove the battery, reverse to install a new battery. Yes, it might make the iPhone or iPad slightly thicker, but a good tradeoff in my opinion.
-dirt, water entry;
-tolerances to suit the inevitable 3rd-party battery suppliers;
-repairs needed thanks to the inevitable crap 3rd-party battery suppliers;
-safety issues thanks to the inevitable crap 3rd-party battery suppliers;
-extra volume and weight needed for modular battery access; and needed in a single large rectangular spot;
-added expense/weight building a module to accept removable batteries and the necessary complex electrical connection;
-existence of readily available third-party add-ons for those customers who need additional battery without forcing all customers to accept the downsides of removable batteries.
Bottom line is that user-removable batteries are simply less-good design.