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The Leaf has an app called LeafSpy that can show battery capacity as a % of new, as well as voltages of individual battery banks so that one can determine how closely matched they are.
Does such a thing exist for any other makes/models? That makes determining battery health simple.
Oh, and the Leaf has "bars" in the display indicating overall battery health. These bars slowly decrease as the battery wears, and can give owners a rough idea about degradation (to within perhaps 5%).
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