Stores 8 AA batteries tidily in a neat translucent plastic box, which may be closed with a plastic catch. Markings on the side of each box allow you to separate charged and discharged batteries. Any number of boxes can be stacked horizontally, but I find it a good idea to secure stacked boxes with strips of electrical tape underneath.
Keeping charged cells in these boxes is an excellent way of preventing accidental short circuits.
It is a great pity that the version of this box for AAA batteries is no longer available, although this AA box may also be used to store AAA batteries.