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 21700 vs 18650 Battery: Differences, Capacity, and Uses 21700 vs 18650 Lithium ion Battery Cells DMEGC 21700 Battery Cells 40P, 45E and 50E 18650 vs 21700 Best Vape Battery for Your Kit? V2 Cigs UK
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