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VARTA Longlife Power 9V Block 6LR61 Alkaline E-Block Battery (2-pack) - Made in Germany - ideal for fire alarms, smoke detectors, tuners: Amazon.co.uk: Electronics & Photo
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Amazon.com: Allmax 9V Maximum Power Alkaline Batteries (4 Count) – Ultra Long-Lasting, 7-Year Shelf Life, Leakproof Design – Perfect for Smoke Detectors & Wireless Microphones (9 Volt) : Health & Household
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