I bought a battery replacement for my lumia 930 smartphone from these guys. The price was surprisingly good and they had all the right Nokia part numbers. I thought "hey, these guys must have some 'new old-stock' of these", so I bought one under the impression it would be a brand new item.
Unfortunately, it wasn't. That could hardly be further from the truth. I should note that at no point was there indication on their site listing that this was for anything other than a new and genuine part. I should also note that on checking their listing for the item again, any mention of "new" and "unused" have mysteriously vanished. Hmm!
The item was certainly an genuine Nokia made battery, but it wasn't brand new. Indeed, it just came loose in a massive DPD bag (with the 'packaging' box just floating around inside the bag, totally separate from the battery!) and was absolutely covered in crud, debris and detritus. It looked as if they had pulled it from a heavily used phone and just threw it in the bag without cleaning or inspection, packaging or even paperwork.
I'm not even going to test this battery, it's that disgusting. It wouldn't surprise me if it was either totally dead or if half the cells wouldn't hold a charge.
These guys are, at best, cowboys. Stay away.