I've been reading the manual, watching videos, reading posts and trying to properly understand the "Winter Mode" function for Kona EV that have the battery warmer fitted. I thought I'd layout what I now think it does. Please be kind to me if I've got it all wrong, because the manual description is pretty useless. You only get the "Winter Mode" on/off menu option if your Kona EV has the battery warmer fitted. The BMS will use the battery warmer to heat the battery whilst plugged into a charging connector, regardless of winter mode off or on, according to the battery temperature automatically. Manual page "H6". Winter Mode ON will heat the battery whilst driving if the battery gets very cold. I've read others say at under -10 deg C. So point 3 is really what 'Winter Mode" is all about, heating the battery whilst driving in very cold conditions for 2 reasons; At very cold temperatures (under -15 Deg C) the BMS will drastically reduced the power output from the battery to a very low 35 kW. With Winter Mode ON, the battery warmer will prevent the battery from becoming too cold and thus continue to allow full power output from the car, at the expense of reduced range (because the 2 kW battery heater is used whilst driving) Because the battery was heated during driving, fast DC charging is possible at higher rates immediately, because the battery has not allowed to get too cold. Without winter mode ON, the battery heater would come on when plugged in to charge, but obviously it will take time to heat up the battery and allow the faster DC charging rates. So winter mode ON helps faster DC charging rates, only useful at low temperatures and again at the expense of range as the battery warmer operates whilst driving. Therefore in Auckland NZ, with our comparatively mild climate (rarely under 0 Deg C, a few frost days per year) Winter Mode ON or OFF makes no difference, because it won't operate anyway.