Lion reduced battery life for some number of installers.
FORBES: Links 7 August: Apple's Mountain Lion Battery Problems Edition
Some say downgrading to Lion has brought battery life back to its earlier levels, though Apple has now removed Lion from the Mac App Store.
The much more serious point is that no one really knows why the move from Snow Leopard to Lion caused such loss of battery life.
FORBES: Mountain Lion Kills Battery Life Like Lion Did
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