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The little battery is 12 volts. The other one is a typical AA battery of 1.5 volts. : r/mildlyinteresting
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Overview of Batteries in Series or Parallel - Tech Tips - Engineering and Component Solution Forum - TechForum │ Digi-Key
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Amazon Basics AAA 1.5 Volt Performance Alkaline Batteries - Pack of 36 (Appearance may vary): Amazon.co.uk: Electronics & Photo
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