The Arizer ArGo and Air replacement 18650 battery will ensure your vaporizer is always ready for use. It is a high-power, high-quality, and long-lasting battery. By always having one of these replacements on hand, you'll never have to wait for your Arizer ArGo battery to charge. Simply swap out the dead battery for a new one, and you're good to go! PLUS, you can easily store, protect, and check the charge level of your Arizer batteries with the new battery charge tester. SPECIFICATIONS Nominal voltage: 3.7V Size: 18650 Rechargeable: Yes Composition: Lithium Battery capacity: 3400 mAh Ref: NCR18650B Li-on MH12210 WHAT'S IN THE BOX? 1 Arizer battery compatible with Arizer ArGo, Air, Air II and Air Max. 1 Charge tester