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18650 vs. 21700 Li-ion cells – A direct comparison of electrochemical, thermal, and geometrical properties - ScienceDirect
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The ultimate comparison guide of 21700 battery vs 18650 - two Li-ion cylindrical batteries-Tycorun Batteries
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Custom 18650 21700 32700 V battery pack, etc. can be customized according to the size and connection port provided by customers - AliExpress
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