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 Lithium Battery Cell Models and the Industry Shifts 21700 vs. 18650 21700 vs 18650 Battery: Differences, Capacity, and Uses 21700 battery vs 18650 A Comparison Guide Ventron
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