Procter & Gamble Co said it would split off its Duracell battery business into a separate company as it looks to focus on its faster-growing brands. The world’s largest household products maker also reported a slight fall in quarterly sales. Net income attributable to Procter & Gamble fell to $1.99 billion, or 69 cents per share, in the first quarter ended Sept. 30 from $3.03 billion, or $1.04 per share, a year earlier.