Originally Posted by
ubizmo I've bought three extended batteries now, and got only temporary peace of mind! The first had to be recloned after every reset, so it was useless. The second, the ecell Gold, worked fine but when I had to exchange my handset it couldn't be recloned for the new one. The third, the Momax, won't work on my 9900 with OS versions .402, .428, and .523. Maybe it'll work with some future build, but I doubt it.
I'm not spending more money on extended batteries until there's one, in the 1400 or so range that doesn't need a special back cover, that works without cloning.