21700, 18650, 20700 and others simply refer to the physical size of the lithium ion #battery cell. For 18650, its an 18 mm diameter x 65 mm length. 21700 is 21 mm x 70 mm. While the explanation is The Ultimate Guide To 21700 Li ion Battery Pkcell Battery 26650 vs 18650 Lithium Batteries: A Comprehensive Comparison 18650 vs 21700: Capacity, Performance & Applications Pkcell
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