Recharge battery charger for apple watch This is a re-charge battery charger compatible with the Apple watch series, not for other brand watches and phones.it has built-in 1000mAh lithium-ion battery, lightweight and portable easily pack it on your bag with the key chain, hook the backpack pocket carry it anywhere, extend your watch life once low power emergency condition, portable apple watch power bank,it's a perfect choice for apple watch accessories Tips--Charge time For watch: within 2-4hours fully charge, based on this charger is fully charged; For this charger: 100% fully charge the charger about 1.5 hours Tips--Compatibility for Apple Watch Series 9/8/UItra/7/6/5/4/3/2/SE/Nike Not for Apple Watch Series 1 Not for others smartwatch model All offers & questions welcome!