Interpret the iPod Mini (power & battery) diagnostic results

I'm looking for a way to test an iPod Mini's battery in the same way people can use a program like Coconut Battery to test a Mac laptop battery and probably an app for an iPhone or iPod Touch.

In Diagnostic Mode, I went to Power, then A2D, then ADC Test, and was able to glean values for ID, VCC, Battery, and ACC (the iPod Mini was unplugged at the time of the test).

I don't know how to interpret their numerical values.

I'm open to putting different firmware on it, like iPod Linux, PureData, or Rockbox to get another set of numbers relating to the battery's health.