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Nitecore 21700 Li-ion Rechargeable Battery Nl2150 5000mah 3.6v 18wh Intergrated Battery Overcharge Discharge Protection Circuits - Portable Lighting Accessories - AliExpress
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Amazon.com: 21700 18650 Battery Charger with Capacity Test Function,21700 Battery Charger 21750 18650 Charger with Capacity Test for 20700 22700 26650 26700 16340 (RCR123) Ni-MH Rechargeable : Tools & Home Improvement
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Imalent Switzerland - Imalent battery - type "21700" - 5000mah (MRB-217P50) with micro USB charging port
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