These 21700 batteries are a larger-sized cell than traditional 18650 batteries. They are meant only for devices that are specifically designed for 21700 batteries. Please refer to the hardware specification to determine the appropriate battery size required.
*Batteries are sold individually*
Samsung 21700 - 3000mAh
Golisi 21700 - 3750mAh
Please note that battery cells require top-notch care. If your battery experiences damage of any kind (dents, tears in the wrapping, scratches on the wrap, etc.) they should be properly recycled and you will want to get new batteries to be safe.
*Need a 21700 Silicone Case carry your battery?*