How to charge an extra cell phone battery?

I’m getting my 1st cell phone in a couple months and I’ve got my eye on a phone that doesn’t have that great of a talk time(RIM Blackberry Pearl 8100). So I was planning on getting an extra/spare battery; but I don’t really know how I would charge it separately without having to insert it into my phone and then charge the whole phone. Can anyone explain how I would do this?

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