You'd have to watch it nonstop for a few hours/days to see that the light color changes from green to red when the battery drops off its max charge level...and until it brings it back up and turns to green again.
The Battery Tender draws very little house hold current when the green light is on so it is best to leave it hooked up;consequently, the battery doesn't sulfate and it should last much longer.
Leave it hooked up, less trouble that way and it will keep the battery ready. I only have 1 battery tender and I keep it working between both my bikes 1 week at a time.
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