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thinking on those KERS (XD) suspensions... I think that for using them you need to couple with some kind of battery, like the capacitor in the flashlight.
You charge the capacitor applying a shake for some seconds, charging the capacitor.
LED that doesn't consume so much, so a capacitor is ok because is relatively fast to charge and slow to discarge.
In a car, it's difficult to use them because you need to apply a continous energy to the batteries to charge them (ironic - > like shaking for 1 hour the suspensions) to use it for something really mileage-increaser.
That's my opinion, I have yet to study EMF >.<"
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