This is the battery pack for Mercedes' plug-in hybrid prototype from 1982. It weighs 1,322 pounds and it practically takes up a whole station wagon.

While our battery packs are lithium-ion not nickel-iron these days, plug in hybrids are still only trickling into the marketplace. I'm not sure if this Mercedes shows how far we have come in electric car design in the past 21 years, or how little progress we've really made.


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