Yes I have purchased them before from this site ant it was an original I live chatted dji and confirmed the serial number with them and they confirmed it was original. The battery I have is identical to my supplied batteries from dji and has worked flawlessly. There was a large thread on hear last year around early December where I found out about them and all others agreed they were original if you search you should be able to find it. Hope that helps.
All I can say is I've used them and people I know have for various items and not had a problem. I ordered them last night so I expect they won't be hear for a week so I will check them out as usual and if I'm not happy I will just return them.