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The biggest problem w/ hydraulic hybrids in passenger vehicles is the weight of the accumulator. Even low weight CF accumulators still run about 240lbs for ~.3kWh of energy storage. A battery pack in something like the Prius is ~100lbs and has ~.7kWh of useful energy, so even low weight accumulators would clock in above 500lbs to get to the same amount of energy storage a 100lb NiMH battery pack has.
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