Sorry, I can’t get google to understand my question. But there it is. Have there been studies on this, or have you turned off your car at work, outside at 25 degrees, with 74% charge, only to return to it 9 hours later with 68% charge? Thanks in advance.
Do you by any chance own a VW ID or Cupra born? (Or maybe any other VAG Car? There was a recall regarding faulty batteries where this issue occurred, and a lot of cars got battery modules replaced
No, the cold itself does not sap the charge by itself somehow. BUT a colder battery will be able to output less energy due to higher internal resistance (more energy lost to heat when discharging). Some cars bms are advanced enough to be aware of that and therfore display a smaller number.
I haven’t noticed that. If I charge to 80% and it’s below freezing and the next day when I get in the car it’s still at 80% even if it’s not been plugged in since the day before.
Due to electronics on EVs, and many other cars too, there will be a small amount of power used to maintain cell service for the phone app and gps or to monitor signals from the fob/remote. So if it sits for a week it may loose a few percent regardless of the temperature.
Above freezing, not much, but if it gets really cold the car should keep itself from damage. Not to worry, 110V 10 amp will either charge or break even.
Storing cells at freezing temperatures does not cause lasting damage.
Yes, now consider the car should be ready to drive at all times without damage.
Depends on the cells you use but aside from fast charging and reduced drive power that’s also possible without any preconditioning unless we are talking extreme temperatures below -20C
Exactly, reduced drive power and regen is why some cars keep warm.
EVs typically can’t easily be “completely powered off”.
They all seem to wake up and spin up pumps now and then.
And they never should be. That’s how you get a dead 12.
I’ve had my '21 Chevy Bolt EV through two Nebraska winters so far where I park at work overnight without a plug for charging. I typically see a charge drop of 1% when the temperature is below ~ 20°F (-7°C) and maybe 2-3% when it’s below 0°F (-18°C). My status screen will show that a few percent of my battery capacity has been used for battery conditioning.
I’ve never been overnight in sub-zero temperatures for more than 8-9 hours without plugging in and it’s never been a problem, no matter how cold it’s gotten.I tend to lose ~1% per day in cold weather.
For that energy loss the car is still connected to cellular & the battery pack protection is still running.
Not worth shutting it down.
The BMS in mine, when really cold (which isn’t that often where I live) will show a “lost capactiy” section of the battery bar graph, along with a snowflake icon next to it, indicating temperature-related loss of capacity.
I’ve never seen it use power to keep itself warm, but it does come with advice to keep it plugged in during cold weather.