400Wh/kg Archives – The Green Optimistic green tech news, since 2008 Wed, 11 Dec 2013 18:17:29 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 2667534 Envia Systems’ 400Wh/kg Lithium-Ion Battery – Too Good To Be True? https://www.greenoptimistic.com/envia-systems-400whkg-lithium-ion-battery-good-true-20131211/ https://www.greenoptimistic.com/envia-systems-400whkg-lithium-ion-battery-good-true-20131211/#comments Wed, 11 Dec 2013 16:58:44 +0000 https://www.greenoptimistic.com/?p=44400 A quiet little company with big problems, Envia Systems, originally developed a lithium-ion battery with an astounding 400Wh/kg energy density. Garnering millions of dollars in government and corporate investment, it seems that Envia Systems was well on its way to success. General Motors had put in $7 million toward the development of the new lithium-ion […]

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