More images are now available of the 2026 Tesla Semi Battery and hence we thought we should create an update from the original 2022 Tesla Semi Specifications.
| Spec | Standard Range | Long Range |
|---|---|---|
| Range | ~325 mi | ~500 mi |
| Energy Consumption | 1.7 kWh/mi | 1.7 kWh/mi |
| Fast Charging | Up to 60% in 30m | Up to 60% in 30m |
| Charge Type | MCS 3.2 | MCS 3.2 |
| Powertrain | 3 independent motors on rear axles | 3 independent motors on rear axles |
| Drive Power | Up to 800kW | Up to 800kW |
From the numbers announced [2] we get the usable energy:
- 1.7 kWh/mile and 325 mile range => 552.5 kWh usable
- 1.7 kWh/mile and 500 mile range => 850 kWh usable
The largest battery pack is made up of 9 battery packs in parallel. This then shows that the standard range battery would be 6 of the battery packs in parallel. Each of the individual sub-packs having ~94kWh usable and total capacity would be ~100kWh.
One of the sub-packs shown with the control/power electronics in a cast housing bolted to the side of the battery pack.
These packs use the 4680 cell [3].
This post has been built based on the support of and sponsorship from: illumion, Custom Power, Quarto Technical Services, Eatron Technologies and About:Energy
References
- Robots Everywhere: The First Look At Tesla’s Giant Semi Factory, Core Memory, YouTube
- Tesla Announces Specs for the Tesla Semi, TeslaHubs
- Tesla executives share deep insights into the Semi’s design, battery, range, and engineering, Tesla Oracle
See also: Benchmarking Battery Packs
Any guesswork around cell configuration on the inside of the Tesla Semi Gen2 packs?
I will do the first round:
Hypothesis 1:
3 parallel packs with 240s14p -> 3360 cells per pack divided into 4 vertical stacks with 8 cell ‘trays’ in each
3 packs X 3360 cells X 24.7 Ah X 3.7 V = 921 kWh installed energy
With useable energy = 850 kWh (500 mi range X 1.7 mi/kWh) we get a Soc Window of about 92.3%,
Every ‘stack’ would have 840 cells each. Every ‘tray’ would have 7×15=105 cells each.
Any Thoughts? Should I put it on Polymarket?