At an AC charging station, AC power from your grid is supplied to this onboard charger, which converts it into DC power to recharge the battery. DC chargers offer higher power charging (which calls for much bigger AC-to-DC converters) by setting up the converter in to the charging station instead https://landendpffu.canariblogs.com/indicators-on-dji-car-charger-you-should-know-47883785