Hitech Replacement Cordless Phone Battery for Southwestern Bell FF2400, GH2400S, GH5825, and More Capacity: 700mAh Voltage: 3.6V Chemistry: Nickel-Metal Hydride For Southwestern Bell BP36MLX400NMH, BP36MLX600NMH FF2400 through GH5835, and others High quality, guaranteed to meet or exceed original specifications.