Some reports suggested it's great, others say it's bonkers. Got one for free so tested it a while. Not just is it as bad/good as stock but it simply doesn't have the capacity claimed.
Talking about this one
I had this tested by a friend of mine using some industrial battery tester, and a lot of apps show the same result
So if you want to buy this for the capacity, stay clear. If you want to buy a cheap battery, by all means.
Talking about this one

I had this tested by a friend of mine using some industrial battery tester, and a lot of apps show the same result

So if you want to buy this for the capacity, stay clear. If you want to buy a cheap battery, by all means.