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Modern S Pens do get their power from a super capicator rather than lithium-ion batteries, which Apple and Microsoft use. A bit about the latest S Pen features for Tab S7/S7 Plus https://www.techradar.com/uk/news/samsungs-galaxy-tab-s7-update-brings-even-better-s-pen-features-to...
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My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.