| http://www.w3.org/ns/prov#value | - Some types of lithium cells (let's pick A123 since they are well known) have outrageous power densities (hence their use in power tools where you want high torque) but rather poor energy density, yet their energy density is an order of magnitude better than the best ultracaps.Round trip energy efficiency for lithium type batteries is already on the order of 90%.
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