Donut Lab Battery Technology Reaches 80% Charge in 4.5 Minutes
The Finnish startup Donut Lab launched its instantaneous battery charging technology in March 2026. The development aims to overcome the primary logistical obstacle which currently hinders electric vehicle charging stations because drivers require excessive time for battery recharging. The battery test results demonstrated that the devices could achieve their maximum charge capacity within a shorter period than existing industry benchmarks require.
The VTT Technical Research Centre verified the operating speed of the new cells according to their data. The 26 Ah battery tested in controlled conditions achieved 80% charging after 4.5 minutes with a 4.3 V power supply.
The quick energy transfer process creates considerable thermal energy which requires effective thermal management solutions.
- With Active Cooling: The battery system maintained its temperature at 63°C throughout the operation.
- Without Cooling: The system temperature increased to 90°C which created conditions that could lead to either equipment failure or dangerous situations because thermal dissipation remained insufficient.
Research conducted by outside scientists confirmed the charging speed of the system while Donut Lab published additional performance data which remains unverified by third parties. The company claims the following for its new hardware:
- Energy Density: 400 Wh/kg, which would place it significantly ahead of most consumer grade lithium ion cells.
- Cycle Life: A service life of up to 100,000 cycles which extends beyond the lifespan of the vehicles that use it.
Experts advise exercise caution because the 400 Wh/kg density and cycle longevity require testing in real world settings outside laboratory environments. The specialized cell manufacturing process requires undisclosed costs for commercial production at high volume.
The confirmed charging velocity represents a major shift in battery potential. If Donut Lab can stabilize the heat issues and prove the durability of these cells, the technology could minimize the need for massive battery packs, instead favoring smaller, lighter units that can be refilled as quickly as a traditional internal combustion vehicle. The Finnish startup faces its core industry test when it attempts to transform its prototype testing results into successful market production.
