Hei, Norge
Your winter is the real battery test.
Norway drives electric like nowhere else, and a battery never works harder than it does below freezing. Akkubrief documents how your Tesla's battery develops through this winter and beyond, free of charge.
47 of 50 places still free.
Tesla only at launch — more brands to follow.
Nothing tests a car battery harder than everyday driving through a Norwegian winter.
Same figure today. Different story.
To a buyer, two EVs can look the same today even though their batteries developed differently before. That open question becomes part of the price negotiation.
Vehicle A
Today92%
Largely steady across 18 months.
Vehicle B
Today92%
Steady for a long time — then a marked drop.
Example data for illustration, not a real vehicle. Both series run across 18 months and end at 92% today.
Why your winters matter
Cold lowers what a battery shows, not what it is. For battery figures to be fair in January as well, we need cars that drive through a real winter — cars like yours.
Whether that feeds into our analysis, and how, is decided by the data. We promise no outcome in advance.
A sketch without a degree scale — what counts is the range below zero.
What's in it for you
Your battery history
How much capacity your car can actually use right now, and how that holds up week by week as the winter goes on. The history keeps growing as long as you stay connected.
Your Akkubrief, free
As one of the 50 panel cars, yours gets the signed Akkubrief free (normally €79). Redeem it within two years — when you sell, for instance.
Disconnect at any time
One click in your account cuts the connection and deletes the data we hold on your car.
What you can hold us to
- You sign in on Tesla's own site — we never see your password.
- Read-only access: we cannot control, unlock or start anything.
- We never wake your car.
- No location access — we do not even ask for it.
- You can revoke access at any time — with us or directly in your Tesla account.
Joining takes two minutes
You connect your Tesla account through the official interface and pick your car. We take it from there.
47 of 50 places still free.
This panel is not a sales programme: we are not selling you anything here, and taking part costs nothing. You can claim your free Akkubrief at any point within two years of joining.