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The Prius is pretty picky about messing with the battery. If you're very lucky, everything will plug right in and the car will recognize the extra capacity. Look at aftermarket/DIY plug-in setups if you want to see how much "fun" it'll be if it doesn't work out like that. Plus when you're done, you might not even see any fuel economy increase unless you live in a hilly area or are otherwise regularly filling the existing battery using regen.
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