The 2026 Mercedes-AMG GT 4 door Coupe battery pack details have been released, well, quite a few of them.
- net capacity = 106kWh
- 800V
- Total number of cells = 2660
- 860kW peak power
- “AMG High Performance Electric Battery” (AMG HP.EB)
- Thermal
- directly cooled cylindrical cells
- uniform temperature distribution
- exceptionally high cooling capacity of at least 20 kW, a significant improvement over the 5–8 kW of conventional battery systems
We know the cell is 26mm in diameter and 105mm high. We also know the volumetric energy density is 732 Wh/litre. That then gives us:
Cell nominal energy = 40.81 Wh
We know that there are 2660 cells in total (is that correct? see below) and hence:
Total pack energy = 108.55 kWh
What is the pack configuration? Mercedes state 800V architecture, suggesting that there are ~180 to 220 cells in series.
Factors of 2660 = 1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 95, 133, 140, 190, 266, 380, 532, 665, 1330, and 2660
140 is rather low to claim 800V, even at maximum charge voltage this is 588 V.
266 is very high as maximum charge voltage is 1117.2 V and beyond the voltage of most chargers.
The means the series string = 190 and the parallel string = 14
Mercedes AMG HPB80
First introduced in 2021, this Mercedes PHEV battery pack used 21700 cylindrical cells and dielectric cooling with the dielectric coolant flowing around the mid-section of the cells.
- Modules
- grouped into 18 laser-welded plastic modules. Here too, the focus is entirely on performance, because the direct cooling of the cylindrical cells is integrated into the plastic modules to ensure optimum heat dissipation
- high-tech coolant based on an electrically non-conductive oil flows around each individual cylindrical cell
We have established that the pack configuration is 190s 14p.
The Mercedes Media [1] states that there are 18 modules. However, if we look at the factors of 190 we get:
1, 2, 5, 10, 19, 38, 95, and 190
It would be best if every module was the same, that suggests there are 19 modules, each 10s 14p
The image of the module shows the cells in rows with a total of 22 of the 4 cell rows and 22 of the 3 cell rows.
Assuming this is fully populated this module would be 11s 14p.
In 18 modules that would bring us back to 198s 14p and a total of 2,772 cells.
That feels more sensible.
We need a bit more data to resolve this.
This post has been built based on the support of and sponsorship from: illumion, Custom Power, Quarto Technical Services, Eatron Technologies and About:Energy
Total pack energy = 2772 x 40.81 Wh = 113.1 kWh
- Cells
- Chemistry
- NCMA cathode
- silicon-containing anode.
- 298 Wh/kg or 732 Wh/l
- tabless cell design
- laser-welded aluminium cell housing is also a new development. It is not only significantly lighter than conventional “steel cans” but also offers outstanding electrical and thermal conductivity
- The cells are 105 millimetres high and measure 26 millimetres in diameter.
- Chemistry
The use of an aluminium cell can is very interesting and Speira have published a number of articles based on their research showing: thermal, weight and safety improvements.
We have also seen 4695 cells with aluminium cans: JLi Battery Co 37Ah 4695
The internet says the cell is manufactured by EVE in partnership with Mercedes.
- Charging
- 600kW peak charge power
- 10 to 80 % State of Charge (SoC) takes only 11 minutes
- system can switch from 800 to 400 volts
- BMS
- The temperature of the battery management system (BMS) is actively regulated via a special cooling plate, enabling higher currents. For the first time, virtual sensors are also used: the BMS determines temperatures – such as within a cell – not via physical components but through mathematical models based on the current charging power.
It is interesting that the system can switch (bank charging) from 800V to 400V if required for charging.
Mercedes proudly say they are using virtual temperature sensors. However, we would expect them to also be using some physical temperature sensors to ground/calibrate the system.
- Structure
- high-voltage battery is integrated centrally into the structure of the e-skateboard. Its protective housing (safety box) encloses the cell modules, all switching components and the battery management system (BMS)
- battery housing is part of the vehicle structure and integrated into the crash concept.
- high-voltage section with busbars is arranged as an “upper floor” along the “spine” of the battery, similar to a centre or transmission tunnel. This high level of integration into a single component ensures very efficient use of space.
Honestly, the battery pack structure is from the previous generation and nothing stands out as being novel.
Rear foot garage is something from the 2019 Porsche Taycan. The Porsche used the foot garage for the front seats to allow a better driving position. The Mercedes AMG GT is using this to improve the rear seat experience.
References
See also: Benchmarking Battery Packs