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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

• nvk 10y ago
  Wonder why they didn't mention LiFePo4. Amazing, non explosive production cells. A bit pricier, but not that much.
  • jpm_sd 10y ago
    The energy density (Watt*hours per kg) is about half compared to the "explosive" cells on the market.