Duracell Coppertop Specialty a23 Batteries (2-pack) 004133366150 - The Home Depot
Jez @ Peak Electronic Design Ltd 💙🇪🇺 on X: "The inside of the Duracell 12V MN21 battery is simply 8 button cells. Seems wasteful on packaging as the active volume must be
Amazon.com: Synergy Digital Replacement Battery, Compatible with Duracell MN21/23 Replacement, (Alkaline, 12V, 33 mAh) Battery : Health & Household