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Originally Posted by AshenGrey
I wonder if there might be a way to create a sort of "portable" EV pack that could be used with a HSD-type hybrid. I would think it would be more convenient to bring in a briefcase-sized pack and plug *that* into a wall outlet instead of having to drag an extension cord out to the car.
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Hey, that's not such a bad idea - you've got me thinking!
Assuming the maximum weight of the "suitcase" you would be willing to lug about was 25 kilograms (55 lbs), then assume 5 kg of that for packaging, electronics and cable etc, that leaves you 20 kg free for batteries.
Then using the best energy density 18650 lithium cells available off-the-shelf (Sanyo 211 Wh/kg), that 20 kg of batteries amounts to 20 * 0.211 kWh, or about 4.2 kWh of energy storage. Enough for up to 20 miles EV mode, not bad for a suitcase!
You could even take it into work and charge it while hiding it under your desk! If disguised as an ordinary briefcase, nobody would be any the wiser and your boss would be paying all your commuting costs!
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Originally Posted by AshenGrey
Or... would such a unit be too small to push a car?
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Doesn't really matter if it can or not. So long as the energy from the pack contributes to the "mix" at all (by helping assist the gas-engine for most of the time), then less gasoline will be used.