# Donut Lab battery cold weather performance testing

> Live situation record from CLSTR: https://clstr.news/situations/donut-lab-battery-cold-weather-performance-testing
> Updated: 2026-10-23T20:50:39.000Z. Sources: 7. Developments: 2.

Finnish technology company Donut Lab released test results from the research organization VTT regarding its battery module performance in extreme cold. Testing showed that a 14-cell, 48-volt module retained 97% of its ampere-hour capacity at -30°C, though total energy delivered in watt-hours was approximately 93% of the baseline due to voltage drops.

This performance was achieved without insulation, heating elements, or thermal management systems. The results aim to address challenges in electric vehicle adoption where cold weather typically reduces battery energy and charging performance.

## Timeline

### 2026-10-23: New battery technologies demonstrate efficiency in extreme cold and energy storage

New battery advancements show Donut Lab's technology maintaining 93% energy at -30°C, while TES technology in Costa Rica reduces refrigeration energy use by up to 90% during peak hours.

2 sources. https://clstr.news/cluster/new-battery-technologies-demonstrate-efficiency-in-extreme-cold-and-energy-storage

### 2026-10-21: Donut Lab battery retains 97% capacity in -30°C cold test

A test by VTT shows Donut Lab's battery module retains 97% of its ampere-hour capacity at -30°C without thermal management, addressing a key performance hurdle for electric vehicles in cold climates.

5 sources. https://clstr.news/cluster/donut-lab-battery-retains-97-capacity-in-30c-cold-test

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Cite as: Donut Lab battery cold weather performance testing. CLSTR, https://clstr.news/situations/donut-lab-battery-cold-weather-performance-testing