Question: how to fix xbox 360 wireless controller battery pack?
Answer:  Insert Battery 1 + Side Down.  Insert Battery 2 - Side Down.  Insert 4 Pennies on top of/in-between 2 batteries.  Make sure batteries and pennies are snug and securet.  Cut 3 pieces of electrical tape (2 shorter, 1 longer)  Put 2 pieces of shorter electrical tape over batteries horizontally.