Yep given the weekly drip feed of information and charging fingerprint matching a high-end NMC battery. I am finding this more and more sus. It's probably a very high end expensive battery but not the miracle that was promised in CES.
Donut Lab drops another VTT report this time focused on High Temperature Performance Here is the TLDR:
The Battery & Test Setup
- Cell tested: Donut Lab "Solid-State Battery V1" – a pouch cell labeled DL2
- Nominal specs: 26 Ah capacity, 3.6V nominal voltage, 94 Wh energy
- Tested by: Independent third-party lab (VTT) at customer request
- Test equipment: PEC ACT0550 cell tester + Weiss climate chamber capable of -40°C to +180°C
Performance Results
- Actual capacity measured: 24.9 Ah (slightly below 26 Ah nominal, but within reasonable variance)
- +80°C discharge: Delivered 110.5% of room-temperature capacity (27.48 Ah vs 24.87 Ah at 24A)
- +100°C discharge: Delivered 107.1% of room-temperature capacity (27.61 Ah at 12A)
- Energy efficiency: ~89-90% round-trip efficiency observed
- Charging: All charging performed at +20°C for safety; cell accepted charge normally after both high-temp tests
Physical Observations
Cell used a 2.4kg steel plate on top for mechanical pressure during testing
Post-100°C test: Cell pouch lost vacuum (visible inflation/deflation) but remained electrically functional
No visible damage after 80°C test; cell appeared physically intact after 100°C test despite vacuum loss
Missing claims
Energy density: No weight and volume was mentioned
Cycle life: VTT ran only 3 test cycles total.
Cost Claims: Nothing about cost is mentioned
Material Claims: No chemical analysis or materials analysis.
No abuse testing: No nail penetration, no overcharge, no short-circuit, no crush tests.
Company has said next report will drop next monday i.e. March 9th