Nanotek says that even the first generation devices (which aren't optimized yet) feature fast recharge cycles - and already outperform both supercapacitors and lithium-ion batteries. Recharge time is 10 times faster than supercapcitor and 100 times faster than lithium ion while energy capacity is the same as Li-ion batteries and 30 times higher than conventional supercapacitors.
http://www.graphene-info.com/smcs-new-revolutionary-graphene-based-energy-devices
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