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(Created page with "{|class="wikitable" | !Type !Specific energy<br />(watt hours per kg) !Specific power<br />(watts per kg) !Charge time<br />(minutes) !Self-discharge<br />(% per month) !Roundtrip efficiency<br />(%) !Lifespan<br />(charge-discharge cycles) !Lifespan<br />(years shelf life) |- |Lithium-ion batteries |- |Lead-acid batteries |- |Iron-redox flow batteries |- |Flywheels |- |Hydrogen gas + fuel cell |- |Hydrogen gas + combustion engine |- |Hydrog...") |
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{|class="wikitable" | {|class="wikitable" | ||
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!Specific energy<br />(watt hours per kg) | !Specific energy<br />(watt hours per kg) |