Charging TOUR battery outside of phone

I have a spare battery for my Blackberry TOUR. I would like to be able to charge it while it is not inserted into the phone. That way it can be charging while the other battery is being used in my phone.  I looked under accessories but didn't see a charger that works with just the battery. I would appreciate it if any one knows if this can be done and if so, how.


Thanks in advance.

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