Fenix ARB L21 5000 V2 Rechargeable 21700 Rechargeable Battery How to Visit the Setting on Disneys 'Encanto,' the Cocora Valley in. Fenix ARB L21 5000 V2 rechargeable 21700 battery provides the voltage and power needed for extended runtime and higher lumen capacities. The ARB L21 comes with all the bells and whistles of high quality Fenix batteries, including protective circuits inside the anode and up to 500 charging cycles. Also included are the three sets of overheat protection: pressure relief, microporous, and PTC cathodal block. Don't run out of light; pick up a spare 21700 battery today! Price is for ONE battery. COMPATIBLE CHARGERS ARE THE ARE A2, ARE A4, ARE D1, OR ARE D2. This battery does not have a USB port for direct charging. 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 common.