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Finnish Engineer Built a 21.5 Kwh Battery in the Trunk of an Electric Car – “the Car's Lifespan Will Be Extended by 10–15 Years”

Summary by T&T
Verneri Rantanen has built a container battery that can be used to charge a car or even make coffee. The battery is aimed at older electric cars equipped with small batteries, where it even doubles the capacity.
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T&TT&T

Finnish Engineer Built a 21.5 Kwh Battery in the Trunk of an Electric Car – “the Car's Lifespan Will Be Extended by 10–15 Years”

Verneri Rantanen has built a container battery that can be used to charge a car or even make coffee. The battery is aimed at older electric cars equipped with small batteries, where it even doubles the capacity.

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T&T broke the news in on Tuesday, December 30, 2025.
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