One of Lithium batteries' shortcomings is usage during extreme low temperatures, such as those found in Finland.
Useful life is severely impacted when charging at temperatures below freezing.
What's missing from this article is how well or poorly Katainen treated his batteries.
The Chevy Volt (plug-in hybrid) has a battery heater for it’s lithium-ion batteries. I would think a Tesla would have a battery heater too...