Exactly the same here 
Time will tell about the quality, but the capacity is 5% more (2100mAh). And the battery seems to last much longer, but of course it’s still brand new.
Since some time while charging my phone the battery percentage rises slowly and then suddenly says 100%.
At the same time the percentage plummets sometimes - more often after a restart than while using.
I realy don’t get it.
More over since my battery sometimes lasts for 2 or more days and whith no specific things going different, only one day.
I really would like some advice/help!
Same here, using a brand new battery (2100mAh).