Rechargeable batteries AA

With some batteries, the bump on the + end is not tall enough to reach the contact inside the keyboard, Try rolling a small piece of aluminium foil into a small ball and placing in in the keyboard where the + end of the battery goes, then insert the batteries.

There is no special requirement for the batteries used in either the Magic Mouse 1 or original wireless keyboard. I used either Alkaline or rechargeable AA batteries in both my keyboard and mouse.