Might also work with other chargers.
Step 1: Get Materials
Wii remote (Wiimote)
NYKO Wiimote charger
Note: This might also work with other brands of chargers.
Also: If you mess up, I am not responsible, and if you mess up you can just buy a new skin.
And: Buy your skins on Ebay if you want them really cheap.
Step 2: For lighter colored skins
Carefully, with an exacto knife, cut the skin along the edge of the battery pack, so that when you remove the cut off skin, the battery pack is the only part showing.
Note: Since the skin is a lighter color, you can see through the it.
Step 3: For darker colored skins
Put the skin on.
Cut along using the contours as guides.
Take off the skin, put in the battery pack, and put the skin back on.