I think it's more fundamental: a sealed-in battery uses less space. A removable battery needs protection on both sides of it, not bare electronics, so a battery cover, or an end-plug-in design . The battery itself needs some protection on the sides as well, not just the bare tick sack as internal ones are. The connector for it is also going to be more bulky than a minimal plug-in-once type on an internal battery.
I think it's more fundamental: a sealed-in battery uses less space. A removable battery needs protection on both sides of it, not bare electronics, so a battery cover, or an end-plug-in design [like the LG G5](http://img.talkandroid.com/uploads/2016/04/lg_g5_battery_module_out_lifes_good_play_more_TA.jpg). The battery itself needs some protection on the sides as well, not just the bare tick sack as internal ones are. The connector for it is also going to be more bulky than a minimal plug-in-once type on an internal battery.
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