strange problem

[akmon]

This interesting thread makes me asking to myself -and I would like to read your advices- this question:
Nowadays you can grab a Samsung battery replacement at a bargain Price.
Do you think it deserves buying one now and keeping it when the Prime´s battery lacks its perfomance? Or these batteries will be available in the market for many years?

By the way , what do you think of this battery? Same size that the original:

http://www.ebay.com/itm/New-Extended-Sli...1514495327