Ironically, I can definitely recommend two Nitecore chargers that can handle 21700 cells. The Ul1, and the two-bay Ul2.
Personal favorites of mine since any rechargeable cell that will fit, WILL get charged up. Only slight negative is that they are USB-B, not USB-C when it comes to charging. But both come with the needed charging cables.
Personal favorites of mine since any rechargeable cell that will fit, WILL get charged up. Only slight negative is that they are USB-B, not USB-C when it comes to charging. But both come with the needed charging cables.