Duracell and Energizer have been suing each other over advertising claims for years. The complaint, which Duracell filed in federal court in Manhattan last week, took fault with Energizer's statement in a new ad campaign that Energizer Max batteries last 10% longer than Duracell Power Boost batteries. Duracell claims to have suffered "irreparable reputational harm" due to the ad campaign, which Energizer launched earlier this month on TV, YouTube, Facebook, and Instagram. Energizer Max outlasts Duracell Power Boost by 10%." Duracell filed a legal complaint against Energizer a year later over claims that Energizer Max batteries lasted up to 50% longer than other batteries.