This charger makes field charging your model plane, drone, or quadcopter easy! Just take any 3s or 4s lipo with an XT60 connector and plug it in to this charger and charge dozens of 1s packs. You could also use a wall adapter as supply power so you can continuously charge at home. Once supplied with a 3s or 4s battery, just plug your 1s batteries into the charger to start charging. When you connect a discharged 1s battery to the charger the corresponding ports LED light will turn red until the battery is fully charged. Once charged, the LED will turn green and you can remove your 1s battery and fly!