This powered-up 16340 battery features a USB-C charging port built directly into the battery for quick and convenient fast-charging anywhere you go and a large 800mAh capacity means longer runtime between charges. Safety features include overcharge and over-discharge, short circuit, and overheat protection! The ARB-L16-800UP features a one-year warranty and is designed to retain up to 70% its capacity even after 500 full charge/discharge cycles. Price listed is for a SINGLE BATTERY Shipping Note: Lithium ion batteries are considered "dangerous goods" per US transportation regulations and can often only be transported via ground shipment. Orders containing loose batteries will typically take much longer than predicted to be delivered. Delivery times of 14+ days are not uncommon.