Technology hasn't kept up with that line. Here are 18650 cells on the market, sorted by Wh/kg: http://batteries.parametrek.com/index.html?size=18650&wh_kg=_+_

Technology hasn't kept up with that line. Here are 18650 cells on the market, sorted by Wh/kg: http://batteries.parametrek.com/index.html?size=18650&wh_kg=_+_+dec http://batteries.parametrek.com/index.html?size=18650&wh_kg=... The best are still only 276 Wh/kg, no where near the 350 Wh/kg the graph would predict.