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If you're even the slightest bit interested in this topic, I highly recommend the Nova special "Search for the Super Battery" that aired in February, hosted by David Pogue.

https://www.youtube.com/watch?v=pCDuM_apIg8

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Wonder why they didn't mention LiFePo4. Amazing, non explosive production cells. A bit pricier, but not that much.

The energy density (Watt*hours per kg) is about half compared to the "explosive" cells on the market.

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