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Tesla Battery Charging Data from 801 Cars



Different batteries have different characteristics when it comes to charging; this goes for the various Tesla battery models too. Through the ABRP data collection by generous users, we have quite a lot of real-world data to base our models for use in the route planning, and in this post we give you some insight into the data. The data here is based on 4600 Supercharging sessions from 801 Tesla Vehicles!

First of all, the battery model of a Tesla is not completely clear from the model name. An almost complete list of Tesla batteries includes:

  • BT37: The 75 kWh battery in a Model 3 Long Range
  • BT60: The old S60 60 kWh battery
  • BT70: The old S70 70 kWh battery
  • BT85: The classic “85” kWh battery in a Model S85
  • BTX4: The 90 kWh battery in S90 and X90
  • BTX5: The 75 kWh battery in S75 and X75
  • BTX6: The top-of-the-line battery 100 kWh in S100 and X100
  • BTX7: A rare 85 kWh battery, where we have almost no data
  • BTX8: An 85 kWh battery found in some rare S75 and X75

Model 3 LR – BT37

First out is the Model 3 Long Range battery. There is a limited amount of data in ABRP’s database – only 38 charging sessions from 13 cars – so please contribute! The blue dots are measured data points  and the red dashed line is the present ABRP charging power model.

The estimated battery capacity from the contributing cars is 72.8 kWh



Model S85 – BT85

Second, the classic S85 battery, which is known for not really being 85 kWh. There is plenty of data here, and as you can see it is charging at very high speed all the way from 0% SoC, but tapers off relatively early.

The estimated battery capacity from the contributing cars is 73.4 kWh. That’s why I wrote “85”. It has basically the same capacity as an S/X75.


Model S70 – BT70

The older S70(d) battery is similar to the BT85, but smaller. From data, the estimated usable capacity is 65.7 kWh.




Model S/X90 – BTX4

The S/X90 battery, is like the “85 kWh” battery also not really living up to its name. The estimated capacity from the data is 79.8 kWh. It differs from the BT85 in that it charges slower at really low SoC (below 10%) but it compensates by charging a lot faster at higher SoC.

Charging at BTX4 battery from 10 kWh to 50 kWh takes 23 minutes. The same charge (in absolute energy, not %) takes 27 minutes in a BT85.



Model S/X75 – BTX5

The “new” 75 kWh battery, sometimes software limited to 60 kWh in a S/X60 has an estimated capacity of 71.6 kWh. The charging curve is similar to the BTX4 and BTX6 batteries, but in absolute power lower due to the smaller capacity.

Charging from 10 kWh to 50 kWh takes 27 minutes.



Model S/X100 – BTX6

The (so far) largest Tesla battery is a real beast. The charging is, in a large SoC region, limited by the 120 kW power output of most superchargers. 20 minutes to charge from 10 kWh to 50 kWh. As you can see from the data points below, owners tend not to ever go much below 10% SoC, and there is a reason – they have so much capacity. 95.7 kWh according to the ABRP data




Model S/X75 Unicorn – BTX8

There are a couple of odd Model S and X 75 with an 85 kWh battery, software limited. It is rumored that they have been fitted with left over BT85 batteries, but the charging curves do not look exactly the same. Anyhow, the result is a battery pack with a lot of extra margin and really fast charging. Lucky owners – 14 of them contribute data to ABRP!




Battery Code Tesla Model Estimated Usable Capacity 10 kWh -> 50 kWh charge time
BT37 3 Long Range 72.8 kWh 23 min
BT60 S60 56.3 kWh 42 min
BT70 S70 65.7 kWh 33 min
BT85 S85 73.4 kWh 27 min
BTX4 S/X90 79.8 kWh 23 min
BTX5 S/X75 71.6 kWh

27 min

BTX6 S/X100 95.7 kWh 20 min
BTX8 Rare S/X75  

25 min


Recommended Comments

Hi Bo,

thank you for showing your charging data. Great work with ABRP!!

I am one of the happy owner of a MS75D with a BTX8 battery :-)  Some comments regarding your data:  BTX8 is a SW-limited 85kWh/BT85 battery, so to "emulate" a BTX5 battery it should be limited to 71.6 kWh, which is 71.6/73.4 = 97.5%. So 97.5% SoC should be the charging limit, where the charging power drops to zero. Instead in your graph above the charging limit is something around 88%, so charging would stop at 88% of 73.4kWh = 64 kWh. Could you please help me, am I wrong?



Link to comment
Guest Julien Higgins


Hi Bo,

It would be interesting to add the battery temperature parameter to the data.

Up here in Canada, it affects by a lot the charging speed.

Maybe the dots could be color-coded associated to a temperature scale. 

Thanks for that great data and please let us know how we can participate to further data collection. I would give you some out of my mid-range Model 3.

Link to comment
Guest Jon Nepthally


Hi Bo,

How nice! you are showing a different kind of battery charging Graph. From this Graph, I am agreed with you about "Different batteries have different characteristics when it comes to charging". Is this vary Battery brand to brand? how the difference show when the brand change or vary. Also, I have a website that does Difference kinds of Deep cycle battery. Here is the link: https://rvexpert.net
I will be honored if you can put this link in your resource page!

Thank You

Jon Nepthally

Link to comment
Guest Marc


Any chance to also show the graph for the BT60 battery?

Link to comment


Probably the most interesting data I see here is the 100kwh packs appear to be limited by the power delivery rate of the Superchargers themselves - indicating that existing owners will probably see an immediate jump in charge times when the new v3 Supercharger stations start getting installed / upgraded.

Anyway - Any recommendation about this article will be highly appreciated. - Battery for RV and Other Vehicles

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