Tesla sells its cars with a different battery size. Due to the number of battery cells, the actual capacity in kWh differs slightly from the number used for the vehicle as model designation. Furthermore, it is harmful for a battery to discharge it completely. Therefore, even at Tesla, there is always a safety margin of residual energy in the battery. This residual energy cannot be used for driving. And this reduces the amount of usable energy. The following table shows an overview of the battery size Tesla has installed in their cars. The effective capacity is the total number of cells in the battery. A reserve of this is “locked” by the software and the usable capacity is calculated. This reserve serves to protect the battery from being completely discharged, as this would lead to damage to the battery cells.
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Usable battery size of Model S and Model X
| Vehicle Model | effective capacity | usable capacity |
| Original 60 | ~61 kWh | ~58.5 kWh |
| 85/P85/85D/P85D | ~81.5 kWh | ~77.5 kWh |
| 90D/P90D | ~85.8 kWh | ~81.8 kWh |
| Original 70 | ~71.2 kWh | ~68.8 kWh |
| 75/75D (Standard range) | ~75 kWh | ~72.6 kWh |
| Software limited 40 | ||
| Software limited 60/60D | ~75 kWh | 62.4 kWh |
| Software limited 70/70D | ~75 kWh | 65.9 kWh |
| 100D/P100D (Max Range / Performance) | ~102.4 kWh | ~98.4 kWh |
The source of this table comes from user redvienna from the TFF forum and information from this table compiled by Tesla owners.
The numerical values originally came from a hacker. He read them out of Tesla’s battery management system. See also the following article at Electrek. Unfortunately, the values for the 100 kWh battery are not included. The article was published before the 100 kWh battery existed. The values of the 100 batteries in the table refer to the following newer article from Electrek.
Usable battery capacity of Model 3
| Vehicle Model | effective capacity | usable capacity | Source |
| Standard Range (US model) | ~50 kWh | Wikipedia | |
| Standard Range Plus (US model) | ~55 kWh | Wikipedia | |
| Mid Range (US model) | ~60-65 kWh | Wikipedia | |
| Long Range | ~78 kWh | ~72 kWh | Klausoflafzehle.de |
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