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25 words
Akkubrief issues battery health certificates for used electric cars, without hardware and without a garage appointment, from the charges recorded while the vehicle is connected.
50 words
Akkubrief issues battery health certificates for used electric cars. The health figure comes from the charges of several days rather than a single measurement, with no hardware and no garage appointment. Every certificate is signed and can be checked in the browser against the vehicle identification number.
100 words
Akkubrief issues battery health certificates for used electric cars. Instead of a single measurement, Akkubrief records a connected vehicle's charges and calculates from them how much energy the battery still takes today; a few days with several charges are enough. With the owner's consent, the data comes through the manufacturer's official interface, with no installation and no garage appointment. Alongside the health figure, every certificate states the uncertainty band and the trend, and it is cryptographically signed, so buyers can check it in the browser against the vehicle identification number. Akkubrief is a sole proprietorship of Georg Wächter, based in Berlin.
Facts and figures
- Founded
- 2026, sole proprietorship of Georg Wächter
- Based in
- Berlin
- Team
- One founder, no employees
- Price
- €79 per certificate, one-off
- Status
- Beta: the validation study is running; we do not sell certificates yet.
- Press contact
- info@akku-brief.de
+49 30 23258161
Dataset
What we do
With the owner's consent we record an electric car's charges from the moment it is connected, and calculate from them how much energy the battery still takes today — a few days with several charges are enough. From that comes a certificate with a health figure, an uncertainty band and a trend. It is cryptographically signed, so it can be checked in the browser and cannot be altered afterwards.
Three things that often come out wrong
- No hardware. No plug, no box, no garage appointment. The data comes through the manufacturer's official interface.
- History, not a single measurement. We do not measure once; we evaluate many charges from several days. That is why an uncertainty band always sits next to the figure.
- Verifiable, not just asserted. Every certificate carries a signature that any buyer can check against the vehicle identification number.
Material to download
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Usage rights
Every file on this page may be used free of charge in an editorial context, crediting Akkubrief. Not permitted: passing files to third parties for their own purposes, advertising, and changes to the logo.
Need another format or a higher resolution? Write to info@akku-brief.de