I just looked through the CrackBerry Store and there don't appear to be any external chargers at the moment. I'm sure that will change quickly, as there are external chargers for many other BlackBerry batteries.
I understood the OP to be looking for a way to charge a battery outside the BlackBerry. There's no point in having a spare battery if you can't recharge the dead one while using the fresh one. I'm sure external chargers will show up quickly. They just have to be adapted to the battery's dimensions.
Posted from my CrackBerry at wapforums.crackberry.com