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Duracell Coppertop 9-Volt Alkaline Batteries (4-Pack) 004133302963 - The Home Depot
Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - Pack of 12 : Health & Household - Amazon.com
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9V Battery Backup Circuit using LM7809
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