Technology progression chronicled by GM's vehicle battery packs

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Battery pack on the left belongs to the Chevy Volt and the one on the right, to the ’97 Chevy EV1. The Volt’s battery utilized lithium-ion cells to produce the same 16kWhrs as the older, and 800 lbs heavy, EV1 lead acid unit. Next up: glovebox-sized units that you can swap out like a power drill pack. Okay, I just made that up, but that be sweet.

Flickr via OhGizmo