I ordered this as a replacement battery for my 18+ month old HTC Desire. The original battery has a P/N of 35H00132-05M, while this battery has a P/N of 35H00132-01M.
The replacement is noticeably more snug when put into the phone casing, and when a charger is attached the phone just flashes its Orange & Green lights at me while refusing to turn on.
On the other hand, this battery has attained several 5* reviews, so clearly not all HTC Desire's are created equal and it must work for some people. It also does appear to be a genuine HTC battery, as advertised.
CHECK YOUR CURRENT PHONE BATTERY BEFORE PURCHASE!
I will be returning this battery as soon as convenient, and have ordered this as it's replacement: http://www.amazon.co.uk/gp/product/B0036UW1O4.