Changing batteries is pain. Fine for one time installation, but definitely not for frequent swapping.
Pairing: dongle-right-left connections are oob paired at security level 4, and this level is required in order for them to connect.
Bt hid is paired via a 6 digit passphrase, which you enter on the keyboard, onteracting with the oled display.
Reasons for big batteries:
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bluetooth is power hungry
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modules are power hungry, and difficult to optimize
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the firmware as a whole is a complex beast, and while we already have done some huge refactors and plan yet more, it will take time and we are at still at the beginning of this road, so we don’t know yet how well or bad it turns out, so we want to be sure that led-less operation will give a decent battery life
The assymetry bithers me too. I dont understand why ot is a general fashion to put additional clusters (arrows, numpad) on the right side (where it strongly obstructs access to mouse) instead of left.