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Discussion Starter · #1 ·
Hi all
Can you please explain what the battery pre conditioning is i have tried to search the forum but cant find anything.

Is it only if you go to a supercharger station or do you have to do it every time you charge it regardless of how or where you charge it.

Also is it easy to put it in pre conditioning mode and how do you do it.

Thanks again
 

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Hi all
Can you please explain what the battery pre conditioning is i have tried to search the forum but cant find anything.

Is it only if you go to a supercharger station or do you have to do it every time you charge it regardless of how or where you charge it.

Also is it easy to put it in pre conditioning mode and how do you do it.

Thanks again
It's only when you set a Supercharger as your destination.

You only need to pre-condition your battery for supercharging anyway, rapid charging a cold battery is not recommended therefore pre-conditioning helps with that.

It should work automatically when you're roughly 20 minutes away from the supercharger, although that timeframe will vary wildly based on the state of the battery.
 

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Discussion Starter · #3 ·
It's only when you set a Supercharger as your destination.

You only need to pre-condition your battery for supercharging anyway, rapid charging a cold battery is not recommended therefore pre-conditioning helps with that.

It should work automatically when you're roughly 20 minutes away from the supercharger, although that timeframe will vary wildly based on the state of the battery.
Thank you for your reply and i see what your saying, one other question then is i will possibly be using a bp 150kwh charger in Weymouth a lot as i have a caravan down there, is there a way i can pre condition the battery if i use this charger as tesla will not know to do it for me
 

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Thank you for your reply and i see what your saying, one other question then is i will possibly be using a bp 150kwh charger in Weymouth a lot as i have a caravan down there, is there a way i can pre condition the battery if i use this charger as tesla will not know to do it for me
As far as I'm aware, no, but someone may know better than me.

It's unlikely to do much harm to the battery unless you use it as your main charger, the biggest difference will be the charge speed. If your battery is fairly cold it will charge far slower at a rapid charger like that, than if it is warmed up first.

But it'll still be significantly faster than a 7kW home charger.

I wouldn't get too hung up on pre-conditioning however. My understanding is that the biggest factor in you getting a fast charge, or not, from a rapid charger is: the state of charge. So if your battery is less than 40-50% full you should get a reasonable speed.
 

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Ampera aka IGOR
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I'm pretty sure that if you select a non-tesla rapid charger as a destination then the car will start preconditioning the battery ready to accept the charge if it is given enough notice.
 

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I'm pretty sure that if you select a non-tesla rapid charger as a destination then the car will start preconditioning the battery ready to accept the charge if it is given enough notice.
This was indeed a feature added some updates ago, but I'm not sure the UK has any rapid chargers added to this list. My guess is, if you can see the charger naxt to the superchargers when you filter the chargers in the map view by 3 lightning bolts, it will work.

Another way to warm up the battery is to preheat the car without anyone inside before departure. Not only it warms the cabin but also stalls the motor(s) and uses that heat to warm up the battery.
 

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Ampera aka IGOR
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I thought it was a while ago, I've only ever seen it once and can't recall where it was or where I was going. I've only had three long trips that needed charging en route and one of those was down to Englandshire using superchargers so I expected to see it.
 

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Pre-conditioning is all about preparing the battery to accept recharging efficiently. From a user perspective, the quicker the rate of charge, the less time taken to reach a higher state of charge (SoC).

The rate, or speed, of the charge is affected principally by the current battery temperature, the SoC at the start of charge, the chemistry of the battery and its ability to accept a slow or fast charge (this is also impacted by the size of the battery - a larger capacity battery can charge faster than a smaller batter) and the capability of the charger (speed of charge in kWh).

Each car has a battery management system (BMS) that balances the ability to charge as fast as possible with protecting the battery from a charge speed that could damage it. This BMS factors in the variables mentioned above: battery temperature etc.

Tesla has a feature of preconditioning. In effect, the BMS works out when to warm or cool the battery enroute to a charge to bring it to the optimum temperature to achieve the fastest charge rate without damaging the battery. This preconditioning cannot be activated by the driver directly, rather the car does it automatically. Based on selecting a Supercharger (SuC) as a destination or where the car directs the driver to a SuC as part of a longer route. Earlier this year Tesla rolled out an enhancement where preconditioning would also be used for third party rapid chargers. These can be seen by pressing the lightening bolt symbol in the bottom left of the screen and selecting the three bolt list. Unfortunately, in the UK the list is not yet populated with any non-Tesla rapid chargers.

In conclusion, the car will precondition when it thinks it is appropriate and achieve a quicker charge at a SuC. But perhaps just regard it as a nice to have rather than absolutely essential.
 

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Another way to help the battery reach optimum temperature for charging is to accelerate strongly, followed by immediately lifting off for maximum regeneration as you get close to the Supercharger location. Do this a few times, it’s great fun and gets the pack nicely warmed up.

Obviously only behaving in this manner when it’s safe to do so etc etc.
 

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Another way to help the battery reach optimum temperature for charging is to accelerate strongly, followed by immediately lifting off for maximum regeneration as you get close to the Supercharger location. Do this a few times, it’s great fun and gets the pack nicely warmed up.

Obviously only behaving in this manner when it’s safe to do so etc etc.
Just a personal view because we each have our own personal preferences. I think your suggestion does more harm than good. Preconditioning is designed to help protect the battery whilst reducing the time taken to recharge it. Extreme acceleration followed by rapid regen provides high stress to the battery. Whilst it warms the battery, it works opposite to protecting the battery by preconditioning.

But of course, your method might provide more fun and if you are not the owner (lease etc) then you might not care about the long term impact on the battery. Personally I look forward to the day when purchases of second hand EVs will be accompanied by a detailed printout of the condition of the battery.
 

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how long would it take for you to travel to the charger?
That depends on where you start from! If on a journey it will be from home or the previous charger. So typically 2+ hours in my SR+. Or if I wanted a top up locally it would be just minutes to the nearest SuC. I’m not sure I understood your question properly.
 

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Just a personal view because we each have our own personal preferences. I think your suggestion does more harm than good. Preconditioning is designed to help protect the battery whilst reducing the time taken to recharge it. Extreme acceleration followed by rapid regen provides high stress to the battery. Whilst it warms the battery, it works opposite to protecting the battery by preconditioning.
My suggestion was slightly tongue in cheek but I think you are overstating the ‘high stress’ impact of how the car may have been driven. If the battery pack needs protecting the BMS will take action, either by limiting power (evidenced by the broken orange lines at the top of the power meter) or by reducing regen. This latter event happening much of the time in winter, the former only likely if you take the car on a track.

But of course, your method might provide more fun and if you are not the owner (lease etc) then you might not care about the long term impact on the battery. Personally I look forward to the day when purchases of second hand EVs will be accompanied by a detailed printout of the condition of the battery.
I agree, and even though I never keep a car more than about three years I treat them as if they were to be showcased. When I sold my last Tesla I produced a graph of the battery report from TeslaFi and a photo of the car at 100% charge (displaying miles) to evidence the lack of degradation.

Unfortunately Tesla won’t even give the owner a battery report and are about as secretive as it’s possible to be, so it’s down to owners to evidence however best they can.
 

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That depends on where you start from! If on a journey it will be from home or the previous charger. So typically 2+ hours in my SR+. Or if I wanted a top up locally it would be just minutes to the nearest SuC. I’m not sure I understood your question properly.
Sorry, question was for the OP. If charger is far enought he battery may already be warm.
Preconditioning is an optimization really i think.
 

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Maybe if you navigate to a supercharger, but then drive somewhere else you might trick it into preheating a bit.
Do you have electric at your caravan? You might be able to use your UMC to get enough for pottering around/to reach a rapid on the way home?

Edit. I don't have a Tesla so this could be crap advice!
 
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