I was just reading about BMW's range extender for their electric car, essentially a small gas motor to charge the battery. Why not simply have an electric generator that runs when the car runs to charge the battery? I'm sure it's been thought of before, so there's probably a reason that it's not being done, but I have no clue as to why it wouldn't work. I mean, we already have generators in gas cars that charge the battery. Granted, it probably wouldn't fully charge the battery, but it would certainly have to charge the battery somewhat.
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