Quote:
Originally Posted by MetroMPG
He hasn't posted since it got really cold (-20C / -2F lately ), though he points out that at that temperature, the car's battery warmer kicks in when charging.
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The battery heater will turn on any time the battery gets to -20C. It will take a while at cold temps for the battery to get that cold because of the thermal mass in the battery as long as you are regularly using it - charging and discharging the battery will generate some heat - more when the battery is cold since it's internal resistance goes up at low temps (part of the reason available capacity goes down at low temps). There's no way to tell if the battery heater is running or not.