DX4.8-HR-3U : 4.8 volt rechargeable batter for SPEkTRUM RC transmitters such as DX9, DX8, DX7s. Choose capacity: 2500mAh / 2700mAh NiMH. Replaces original SPEkTRUM battery # SPMB2000NMTX. These battery packs are made in USA by Batteries America, utilizing FDK brand HR-3U rechargeable Nickel Hydride battery cells. These can be re-charged thru the transmitter, or with stand-alone smart chargers for RC batteries.