[Leica] Third party M8/M9 batteries

[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.......