The battery is slightly different from the original battery of HTC Desire (first name): the model number is the same (BB99100), but the "part number" is slightly different: instead of 35H00132-00M 35H00132-06M . The serial number starts with 2LTA instead of 2TGA, but I'm not sure this is significant. The logo is HTC Innovation instead of just HTC.
But these are details, the indicated electrical characteristics are the same, and it works very well.
The only real concern is a very slight difference in size, which is that we must force a little to insert, and especially making it very difficult to remove with the fingers. Personally I do not take all day, so it does not bother me more than that.