Shares of battery maker Energizer Holdingsrn(ENR) have lost power since hitting 113 in early 2008. Energizer, whose TV ads feature the tireless bunny, ran out of steam on Nov. 21 and tumbled to a 52-week low of 30 a share. But it bounced to 50.47 on Apr. 1 as some big investors decided that the sell-off of the stock has been way overdone.
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