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Another thing to consider is efficiency. It becomes much more energy INEFFICIENT to cram electrons against their charge gradient as that gradient becomes larger. In other words, the closer a battery gets to full, the more energy gets wasted just trying to get that battery to a maximum charge. So unless you need that extra 20%, you'll waste less money on charging. That said, I'd bet most people who can afford one of these things probably don't care at all about the extra few bucks (or frankly what happens to the battery long after they've traded the vehicle for another one)
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