[Leica] Third party M8/M9 batteries

[red735i at verizon.net (Frank Filippone)]

Every year this subject gets discussed. 
I postulated, years ago, that the market for the M8 battery type was 
infinitessimal, compared to Nikon/Canon. What correct in the head Chinese 
maker would bother for this tiny market?  My conclusion was none. So how do 
these batteries get made and sold so cheap?  My thought is that , in the 
case of M8 batteries, that there is a reject rate. That the third party 
batteries did not meet some Leica spec. These batteries are sold as 
aftermarket items, cheap. It follows they will not last as long as the Leica 
spec ones. 
As time pases, we have some proof they do not last. 
Here is the financial question:  if Leica makes a battery that costs 
10-20-30 times the cost of the aftermarket brand , but lasts only 5 times as 
long, which is a better buy???  

And the answer is.......