Utilize the input text as a context reference, choose the right relationship between Duracell and battery from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Announced in November 2014, Berkshire said it was buying the Duracell battery business from US consumer goods maker Procter & Gamble in a deal valued at $4.7 billion.

Answer: product_or_material_produced