Why is the battery blinking?

I have an iBook G3 600 running Tiger. I have a battery that won't charge, and when the button is pressed, only one light goes on, and it blinks. That means it's toast. No mystery.
But I have another one, an Apple brand also, that charges properly, but when the button is pressed, all four lights go on and blink. What does that signify? (I also have one that charges and behaves as expected, and Newer Technology one that is fine.)

All four lights lighting up is simply an indication that it is fully charged. I'm not sure about the flashing, though. They should just remain lit for a few seconds after pressing the test button.

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