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Even if not everyone likes the Prius conversion aftermarket results, it can't be a bad thing that there is one more team out there willing to add batteries and a plug to your Prius, right? The WSJ recently profiled Daniel Sherwood and Paul Guzyk of Berkeley's 3Prong Power Inc., which will upgrade your Prius for about $7,000. That seven grand will get you an extra 5 kwh of power from 360 lbs of lead acid batteries (originally designed for electric wheelchairs), enough to go about 10 miles in elec