Battery on the lunch table

Do you remember the Futurama episode where Fry believes to be a robot?
If you think you are a bit "android" why not use batteries?
These batteries.

Ok, they aren't batteries, but salt and pepper shakers designed like a battery with a little window to indicate the amount of charge.

Where you can buy it? ThinkGeek: http://www.thinkgeek.com/homeoffice/kitchen/e7aa/