【Replacement Battery Type】Voltage:3.7 V; Capacity:760mAh Compatible P/N】BP-760S 【Compatible Models】For Kyocera BP-760S contax BP-760S i4r For the initial installation, please reinstall and check the interface fully connected, discharge the battery to 5%(not to 0%) and then charge to 95%, and cycle 3-4 times. Rest assured with 30 days Refund and 12 months Warranty,also get our friendly customer service.