You need to know the main thing - if you have a good, normally charged and newer battery, there will be no problems! Problems only occur with old or dead batteries. I also want to point out that with a broken or old battery, sooner or later you will have problems starting the car even without Webasto or Eberspächer. It is simply important to keep your car and battery in good technical condition Webasto and Eberspächer consume about the same amount of energy as the side lights on. The main consumer is the air conditioning fan located in the cabin. To avoid draining your battery, follow our usage recommendations. The simplest rule - don't run the heater for longer than the duration of your ride. If the ride is 15 minutes, run the heater for a maximum of 15 minutes. If the ride lasts 1 hour, feel free to start for half an hour or 45 minutes if the weather conditions require it.