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10pcs 12Volt Cell A27S L828 MN27 27A 12V A27 Alkaline Batteries for Door Opener | eBay
Amazon.com: A27 Battery By Duracell (3 Packs) : Health & Household
Amazon.com: Pack of 2 x 27A A27 G27A B-1 L828 CA22 GP27A Battery 12V : Health & Household