9.6v 2000mAh Eneloop Tx Pk F SeriesNiMh Battery for Futaba F 14 or FC 16 radios Superb charge retention 90% after 6 months, and 85% even after a year, so no need for regular charging to aviod permanent capacity loss required by many Ni Mh cells Due to this the cells packs can be used immediately they are bought, and do not need charging first! Much higher voltage under load, the voltage does not collapse when high currents are pulled, which is an unwelcome characteristic of normal AA