I didn't realize the Duracell drama waters ran so deep. To be fair, most large companies are tangled in plenty of litigation, but there are two interesting Duracell class actions. One was over misleading statements surrounding superior battery life, and was settled in 2014 for $50 million:

In Joshua Poertner v. The Gillette Company and The Procter & Gamble Company, plaintiffs alleged that the Defendants participated in misleading and deceptive advertising and marketing of Duracell Ultra Batteries. Plaintiffs further claim that their advertising statements including the statements “Up to 30% Longer in Toys* *vs. Ultra Digital” and “Our Longest Lasting,” mislead consumers into purchasing the Duracell Ultra Batteries.
https://topclassactions.com/lawsuit-...on-settlement/


And another lawsuit, explicitly over the leaking issue, was dismissed in 2016:

A federal judge threw out a lawsuit accusing Procter & Gamble Co (PG.N) of misleading consumers by guaranteeing that Duracell batteries would not fail for 10 years, when in fact the batteries might leak when used or stored normally.

In a decision late Tuesday night, U.S. District Judge Lucy Koh in San Jose, California, rejected claims in the proposed class-action lawsuit that P&G and its Gillette unit defrauded consumers in ads and packaging for Coppertop batteries containing "Duralock Power Preserve" technology.

Koh said reasonable consumers would understand that P&G's representation that the batteries were "guaranteed for 10 years in storage" was a warranty to repair, replace or refund batteries that failed within that timeframe, and not a promise that the batteries "have no potential to leak."
Lawsuit over Duracell batteries guarantee is thrown out | Reuters

Interestingly, the suit that settled for $50 million was the subject of considerable debate over the disproportionate amount of the settlement given to the attorneys (94%), vs. the amount offered to affected consumers - up to a whopping $12 cash if you kept the proof of purchase for your batteries: Supreme Court petition in Duracell class action spotlights fee abuses | Fortune.com.