Duracell, the battery unit of Warren Buffett’s Berkshire Hathaway Inc, sued the maker of Energizer batteries on Tuesday, accusing it of falsely advertising that its Energizer MAX batteries last up to 50 percent longer than other alkaline batteries.

The lawsuit follows Energizer Holdings Inc’s own lawsuit last Sept 30, accusing Duracell of falsely advertising that its then-new “Optimum” batteries were more powerful and lasted longer than rival batteries...