Retevis H-777 Two-way Radio Battery 3.7V 1800mAH Rechargeable Battery for Baofeng BF-888S BF-777S BF-666S Retevis H-777 Walkie Talkie (10 Pack) Powerful; Battery type LI-ion battery; Voltage 3.7V DC; Capacity 1800mAH Suitable for Baofeng Retivies Walkie Talkies; Perfect backup for your original batteries of BF-888S BF-777S BF-666S Retevis H777 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 Worry Free Warranty; We offer 60 days warranty and 30 days no reason to return service with our friendly and profession customer service team