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September 28, 2021

Professional Tool Reviews for Pros


How Do Battery Cells Affect Power Tools? Video Review

Around here, we primarily focus on the tools and gear surrounding the construction industry. That makes the 21700 vs 18650 lithium-ion battery cell conversations incredibly relevant to us. After all, these lithium-ion power sources reach far beyond the latest cordless tools. They’re driving innovation in Teslas, hoverboards, the vaping community, and so much more.


21700 Vs 18650: What Do the Numbers Mean?

21700, 18650, 20700, and others simply refer to the physical size of the lithium-ion cell. For 18650, it’s an 18 mm diameter x 65 mm length. 21700 is 21 mm x 70 mm. While the explanation is simple, the difference is profound. It’s easy to see with a quick volume calculation.

18650

3.14(9 x 9)(65) = 16,532 cubic mm

21700

3.14(10.5 x 10.5)(70) =  24,233 cubic mm


An extra 5 mm of length and 3 mm of diameter gives us 47% more volume. That’s a little more than 7,700 cubic mm of space to pack with energy-delivering anode, cathode, and electrolyte materials.

Read The Full Written Review Here

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Fyrfytr998

Man Caver Tools showed how which type of battery cell you have plays a difference in performance. Flex Turbo has been dominating 18650 powered tools, but fell short in his test that Milwaukee and DeWalts running 21700’s passed.

Last edited 5 months ago by Fyrfytr998
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