These note 4 batteries claim to have more mAh than others. Fakes or good?

[AC Question]

I need a new note 4 battery cause the OEM ones are garbage and become defective every year.
Aexpower is one brand. There is another listed here as well. If you look on google or ebay for 3600mah note 4 battery you will see two brands that make it on ebay. (says i cant link cause its spam to link to ebay)
I was under the impression that battery tech hasnt changed at all and this would be impossible to increase capacity in the same space. ANyone have experience with this?

 

[IAmSixNine]

Anker and zero lemon have been pretty good to me over the years.