Ok im taking a punt here and buying a Mugen 1600mah extended battery for my desire. The battery i've gone for is the Mugen 1600mah for the nexus one. As far as i can tell the nexus and the desire share the same BB99100 1400mah battery so it should fit fine. Mugen are a quality brand and my old extended Hero battery made all the difference. As soon as i get it i will update you all with the progress and battery life extention times.