NIMH | Sub C, A/AF, F, more. Construction: Made of 4 x AA NiMH 2000mAh cells. BATTERY COMPATIBILITY - The NiMH Receiver RX battery compatible with the following Futaba radios: 8UA(F/P)S, 8UA(F/P), 8UH(F/P)S, 8UH(F/P), 7NFK, 6NPK, 6YF, 6DA, 7C Series.