I have converted a fox body mustang and a mitsubishi mirage to all electric in the past. Currently, I'm driving a Ford Fusion Energi. I have little useful trunk space and I would like to add batteries to the remaining trunk space to hopefully extend the all electric range of my car. Any ideas or instructions (hacks) available? What type of batteries does it currently have (2016) and what would be compatible? How would I interconnect the batteries so I can extend range? Any suggestions, even those that void my warranty, are appreciated. I'm holding my breath (and my 2020 Ford F-150 3 year lease) for a Lighting but three years is a long time....