Thanks for the information... So the people getting them claim they see a difference, while others are denouncing their posts without trying them. I have no doubt the ZeroLemon one will last longer (it just seems like a much more solid product, its size alone is basically three times that of the original), I went through with it on amazon all the way until the final checkpoint and realized i'm paying $20 for delivery and it will take about a month at least before I receive it...
I'm sure this product claiming to be an 8500mAh battery isn't really 8500mAh... If people are getting a 4500mAh battery they would assume it's lasting twice longer when it's actually giving them a few extra hours of use, and it will probably degrade worse than the samsung one over time.
I wish I can find stock for the ZeroLemon one here in Australia but sadly I can't find any, so I might have to get this one and give it a review myself. It does look like it's double the thickness of the original, so hopefully it's double the life (at least for the first few months before it degrades and melts on my phone and burns it) lol