21700 Battery Guide: What You Need to Know

Key takeaways: 21700 battery is short-hand for a rechargeable, lithium ion battery that is 21 mm in diameter and 70 mm long. The big advantage of a 21700 battery over an 18650 battery is the overall energy capacity possible. 21700 batteries are able to reach a maximum capacity of 5000mAh. How to charge 21700 batteries […]