Nope, I had to swap JP-1-batteries 2-3x a week, as a sleek backup battery was easier to carry around than powerbricks or cables & chargers. This caused material fatigues. JP-1 batteries were designed and promoted as swapable. JP-2-batteries very obviously not.
It was my attempt at curmudgeonly humor, which was apparently unsuccessful!
I suppose I am missing the point, since you clearly pointed out the JP2 battery is not easily swappable, the need for a more robust way of cover removal.
I will admit I won’t be swapping covers daily, or am such a power user that I will drain a 5Ah battery multiple times in a day.
Just happy that the cover IS removable, that the battery CAN be replaced and that a fully Jolla phone came to fruition!
This should be doable, and to cater for heavy TOHs, the back with rails could be screwed down to the phone:
There are also four M1.4 screw inserts (2.0 mm deep) around the device for securing TOH in place. This is useful for heavier and bulkier TOHs that may not have sufficient grip from plastic clips alone.
(From Jolla Phone TOH | Sailfish OS Documentation)