How does the battery proof get into the listing?

Threefold works best: as a photo of the certificate card with a QR code in the image gallery, as a short verify address (akku-brief.de/z/…) in the description, and as the full link on request in chat. That way every interested buyer can see and check it.

How do I convince a stranger of the battery's condition?

With proof they can check for themselves: created independently, tied to this specific car via the VIN, and verifiable in the browser. A screenshot is a self-declaration — a signed certificate is evidence.

Is the effort worth it for a private sale?

Yes. The battery is the biggest value lever on a used EV — around two thirds of buyers name it as their central question. A checkable proof turns that question into a selling point and supports your price.

Prove it before or after listing?

Before. The proof belongs in the first line of text and in the image gallery. For LFP vehicles, do one full charge beforehand so the BMS is calibrated and shows the best figure.

Buying & Selling

Selling an EV on Online Classifieds: Proving Battery Health

Updated: 22.07.2026 · 2 min read

With a Tesla, every buyer asks the same question: "How's the battery?" The good news — hardly any seller can answer it as convincingly as a Tesla driver can. With a checkable proof, the battery question becomes your strongest selling point. Three simple steps bring it into your classifieds listing.

Mockup of a classifieds listing: the Akkubrief certificate card as a gallery photo and the verify address in the description text.

How the proof looks in a listing: the certificate card as a gallery photo (①, with QR code) and the short verify address in the description text (②). Example illustration.

How to bring the proof into your listing

As a photo in the image gallery. Many buyers scroll the photos first — that's where the proof belongs. Akkubrief delivers the certificate as a ready-made image card with the battery figure and a QR code; the buyer scans it and is one tap away from the checkable version.

As a short link in the text. The short verify address (akku-brief.de/z/…) goes into the description — the interested buyer opens it themselves and sees the signed original, tied to the VIN.

As the full link in chat. If someone asks, send them the verify link straight into the message. One tap, and the doubt is settled.

Which proof convinces a stranger?

On an anonymous marketplace, what counts is what the buyer can check themselves. Three qualities make a proof strong: it comes from an independent source, is tied to this specific car via the VIN, and anyone can verify it in the browser. Which routes exist — from the free on-board test to a certificate — is laid out in the method comparison. Akkubrief (disclosure: our product) derives the condition from the charging history across many charging sessions and issues a signed certificate that can be checked in the browser — without hardware, for 49 euros. Why that is tamper-resistant is explained openly on the Security & Trust page.

Tesla-specific: remaining warranty and calibration

Two Tesla details that are worth money in a listing. Work out the remaining warranty — Tesla warrants the battery for 8 years with 70 percent minimum capacity, 160,000 km on Standard/RWD variants and 192,000 km on Long Range and Performance. "Still 3 years or 70,000 km of battery warranty" is something every buyer understands right away. And calibrate before the test: on LFP cells — most Standard Range variants, see the Model 3 overview — charge to 100 percent once so the BMS shows the best, correct figure.

The listing in four steps

Battery in the first line of text — after the price, your strongest argument.
Certificate card in the image gallery.
Short link and remaining warranty in the text.
Stay honest — a documented figure beats any open uncertainty and protects you even after the sale. How this helps you avoid the battery price discount is covered in a separate article.

The short version

Bring the battery condition into the gallery as a certificate card with a QR code, the verify address into the text, and the full link into the chat — and add the remaining warranty. That turns "How's the battery?" into a reason to buy.