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While it’s easy to cre­ate a bat­tery in the lab that per­forms well by one mea­sure, the way such re­sults are re­ported is of­ten a kind of sleight-of-hand … Such re­ports tend to play down the fact that a real-world bat­tery must per­form well by at least a half-dozen dif­fer­ent mea­sures that matter for electric vehicles