21700s are the latest batteries for vaping. They are considered an upgrade over 20700s and 18650s because they come with a larger capacity and can generally be operated at higher wattages. With more and more companies coming out with 21700-compatible vape mods lately, these batteries are considered by many to be the future of vaping.
Most of the batteries that don’t come from long-time electronics manufacturers such as Sony, Samsung, Panasonic and LG, are rewrapped cells. Therefore, we recommend that you try to choose Sony, Samsung, Panasonic, Sanyo and LG batteries, these batteries are cheaper, and other brand of repackaged batteries are more expensive.