Our General Manager uses his Blackberry and nothing else (no PC,laptop,tablet, etc). He also works 14 hour days and demands the extended batteries. He needed a replacement - wanted the Torch 9850, and demanded an extended battery, even if I had to hire engineers to develop them myself... Anyway, after a lot of searching, I found wirelessemporium.com advertising extended batteries for the Torch. We ordered 2 to try. The actual manufacturer is Ontrion. Really weird. Have purchased a lot of extended batteries for him over the years, but nothing like this. Along with the battery and the new door, they send you a device. You have to plug your old battery and the new battery into this, and then the new battery is usable in the device. Seems to work so far! We tested --- tried out of the box into a phone = no dice. After getting it to run in one unit, tried in an identical unit, and it did not work --- until we took the battery out of that unit and ran through the copy process. RIM is doing something to tie a unique identifier to the battery <?! Anyway, so far, so good. Lots of hoops to jump through to get here though --- thought it was worth sharing.