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In page Energizer Bunny:

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Despite the immense popularity of the campaign, sales of Energizer batteries actually went down during the years that the ads ran. Duracell claimed that 40 percent of its customers thought the campaign was promoting Duracell, not Energizer, but provided no evidence. Speculation has it that TV watchers still associated pink bunnies with Duracell, so the Energizer ads were actually helping their competitor's sales rather than their own.[1]