2A Single Lithium Ion Removable Battery Charger For 18650, 21700 etc. – The Saber Armory
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
USB Port Universal Battery Charger for 18650 21700 20700 Li-ion Batteries;USB Port Universal Battery Charger for 18650 21700 20700 Li-ion Batteries - Walmart.com
Kraken 21700 5000mAh Battery with Built-in Charger
XTAR Dual 21700 Battery & Charger Set for MF-2 Flash
Combo: Nitecore 21700 Intelligent Battery System MPB21 KIT: 3-in-1 Light, Charger and Powerbank w/extra NL2150HPi battery - Walmart.com