Like the first test, this one was also conducted by state-owned VTT Technical Research Centre of Finland. The team set out to determine how well Donut Lab's cells held up under extreme heat, which has been known to adversely affect traditional lithium-ion batteries. The results show that not only can the Finnish startup's solid-state battery still discharge energy under conditions of up to 100 degrees Celsius (212 degrees Fahrenheit), it actually gains capacity.
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