21700 vs 18650 Battery: Differences, Capacity, and Uses Vapcell F60 21700 12.5A Flat Top 6000mAh Battery Genuine Liion Wholesale Batteries 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 Samsung 45T 21700 Battery 4500mAh 50A 18650 Battery Store
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