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Also, to address why the Leaf has a regular 12v car battery under the hood when it has a huge 24kWh pack under the car the because the car's computers and accessories run off of 12 volts, and the high voltage pack for propulsion purposes is at somewhere between 300 and 400 volts DC. Now, yes, you could have a DC-DC converter, and it may have one, but for many reasons the HV pack is used for propulsion only and it's contact breakers are kept open unless your foot is on the gas. This is also a safety feature for cases of crashes/etc to keep the HV lines from being hot all the time, as they would need to be if they were to power a DC-DC converter and the rest of the car.
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