From what I've read and personal experience... Either get an OEM Battery or wait for ZeroLemon to come out with their Battery which I think is soon.
The others you'll find on eBay are junk. I bought one just to see and yep.. Junk.
Plus I don't think it's possible to have a 3800mah be the same size as the stock 3000 mah
- Tapatalked from the G3