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Salutations Zee, thanks for taking the available time out of your busy day to ask us your question about the Samsung Galaxy SmartTag2. The battery size for the SmartTag2 is CR2032. If you think of additional questions that you have for us or if you would like any further assistance, feel free to reach out to Samsung Support. Thanks for being a valued Samsung customer. - Debra
Sorry, there was a problem. Please try again later.Respectfully... Google it. https://www.google.com/search?q=samsung+smart+tag+battery+size (a CR2032 battery)
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