This method of charging a glow-stick actually works, but each time you recharge it the glow gets a little fainter. It can still be used for pretty long though. Also this is an entry in the flash light speed contest so if you liked it please vote for me.
Step 1: stick it in the freezer
This is basically the only real step here and all you have to do is put one of your used glow-sticks in the freezer over night.