Duracell Plus 9V Batteries for smoke alarms Pack of 4: Amazon.co.uk: Electronics & Photo
Amazon.com: Duracell Coppertop 9V Battery, 4 Count Pack, 9-Volt Battery with Long-lasting Power, All-Purpose Alkaline 9V Battery for Household and Office Devices : Electronics
Amazon.com: Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 2 count : Health & Household