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Yes, and unlike what has been done in the Prius, these were large-format cells. The patents on them ultimately ended up sold to a Chevron subsidiary, which would only license the technology under absurd terms. They assumed that lithium-based battery technologies wouldn't be suitable. Oops.

https://en.wikipedia.org/wiki/Patent_encumbrance_of_large_au...

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Yes, the exact same battery technology Toyota was already using in their Prius, which is still in-use in many Toyota hybrid models still on the road. The battery was not the problem.
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Prius had 0.91 kWh battery and the EV1 had 26.4 kWh with NiMH. The EV1 was expensive, $80k to produce in 1996 money. A large part of that had to be the battery.
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Eventually, near the end. The first run of them was lead-acid; the battery was about 60% of the weight of the vehicle.
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NiMH batteries suck too
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