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  • Bo Lincoln

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 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 an 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 an absolute beast. In a large SoC region, the charging is 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 never to 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 leftover BT85 batteries, but the charging curves do not look exactly the same. Anyhow, the result is a battery pack with a lot of extra margins and high-speed charging. Lucky owners – 14 of them contribute data to ABRP!

TL;DR

​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

N/A

25 min


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