Rotating your batteries- how do you keep track?

[Brew1961]

Way to get your geek on I have been dying to buy a Binary watch of late and my propeller spins at the thought of a Binary desk clock. 1s and 0s are good. Brew

Use nail polish, and apply small 0's and 1's, using the binary system.

000, 001, 010, 011, 100, 101, 110, 111.

If you have more than eight batteries, use four binary digits.