You don't need to wait for Christmas. If you have a digital camera with its own charger and some basic electrical skills, you can (ab)use that to charge your phone's battery. Observing the polarity, connect the charging pins of your camera charger to the + and - pads on your battery. You will need two wires and something to hold them in place for a couple of hours. Make sure the camera's battery is rated at the same voltage (~3.7V), but nowadays everyone uses the LiIon technology so chances are it will fit.

Note this trick works only for chargers that require taking the battery out of the camera and putting it in the charger. If the camera charges directly through a connector of some sort than this obviously won't work.