I use glass from aliexpress with normal hole with separate camera holder. If you put big hole glass you have the water resist problem.

Does anybody now what is the purpose of circle black sticks on the back housing of the frame ?

I dont know. China perhaps,I buy cell from China for 40 $, never again. I check firmware version of my original battery and new one. On new one was 201, on old 406, same manufacturer SMP. I destroy plastic, and open new one. 6 cell was in there and some small electrnoic. I connect this 6 cell in serial, and connect to small 12V bulb 20 W. The Bulb was lighting 2,5 hours. I think that the main problem is in electronic which is charge this 6 cell. But this i my opinion. I buyed for 100 Eur from OWS, NewerTech NuPower, no problem at all.

I have the same situation. Battery dont want to charge, reset SMC 20 or more times. After 5 hoours, firmware say that is battery finished charged 100 % full. After 2 hours, I take off magic safe. The battery droped after half hour to 90 %. After one minutes droped from 90 to 60 %. after 5 minutes Macbook turn off, and dont want recognize the battery. I turn ON magic Safe, reset SMC, battery goes up to 90 %, what happened here ?