(A) why spend thousands of dollars on camera gear, and skimp on a $100 battery and choose a $20 one? really makes no sense.
(B) 3rd party batteries nearly never perform like originals. i've experienced this time and time again with any electronics....as well as Leica.
(C) it's an odd thing to ask how many have had damage....i think that's what we are trying to avoid here by buying proper batteries.