Retevis 2 Way Radio Battery 3.7V 1800mAh Rechargeable Battery for Baofeng BF-888S BF-777S BF-666S Retevis H-777 Walkie Talkies (1 Pack) Powerful; Voltage 7.2V; Type Li-ion; Capacity 1800mAh Recharge Replacement Battery; Perfect backup of your original batteries; Designed to meet or exceed performance of original battery so that your best replacement Longer battery life; Lager battery capacity allow you dont worry your communication will be interrupted because of no power Suitable for Baofeng Retivies Walkie Talkies; Perfect replace your original batteries of BF-888S BF-777S BF-666S Retevis H777 Worry Free Warranty; We offer 60 days warranty and 30 days no reason to return service with our friendly and profession customer service team