As mentioned there's been kits of that nature for the Prius.My main thought when this comes up is can anyone share an example of any other vehicle being modified for phev, or with just an added extra battery after market?
https://www.enginer.us/products/conversion_kit.php
https://evbatterycenter.com/HAC4/index.php?option=com_content&view=article&id=61&Itemid=630
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