I've been searching for a battery for Sprint Diamond and ordered one from eBay.
The first one I got didn't get recognized by my Diamond (it would work, but not charge or show how much charge is left [unless you used BatteryMon in Juicy's ROM])
The second one I got from the same vendor works (he switched suppliers after giving me a refund on the first non-working battery)
While he makes them look like real OEMs, I doubt they are. I think all of them have the same label with the same battery serial #. I'm running on that new battery though and it seems to work fine so far.
Here is the
auction #260326203791.
The new battery has the same label as the one that came with the phone.