The FlightTech EON X Lite range features 3.5V held at 25C discharge, 3.7V under normal use and 3C charging for fast charging for more time flying. All batteries have the FlightPower/ThunderPower balance connector and the battery leads are already tinned ready for soldering your favourite connector. Finished off with an industry leading 6 month warranty from the time of purchase then you've got the complete power source.