Terms and conditions

Last updated: 31 August 2026

§ 1 Scope, contracting party

(1) These terms apply to the use of the “Akkubrief” service on akku-brief.de and to the purchase of battery health certificates through this website.

(2) Your contracting party is: Georg Wächter (sole trader), Akkubrief, Prinzessinnenstr. 29, 12307 Berlin, Germany, email: info@akku-brief.de, phone: +49 30 23258161 (“we” / “the provider”).

(3) Our offer is directed at consumers within the meaning of § 13 BGB.

(4) Any deviating terms of the customer do not apply.

§ 2 Services: free service and paid certificate

(1) Free of charge are: the user account, connecting an electric vehicle through the manufacturer’s official interface (read access only), and the automatic build-up of the battery history including the display of the battery status. No paid contract arises from this; there is no subscription and no minimum term. Part of the free service is that connected vehicles count anonymously towards aggregated fleet analyses — only as group values with a minimum group size; the details and how to object are set out in the privacy policy (section 14a).

(2) Subject to a charge is the signed battery health certificate (“the certificate”): digital content (§ 327 (2) BGB) that is created and supplied once. The certificate comprises a publicly accessible verification page (link, short code, QR code) and a PDF document.

(3) There is no subscription and there are no recurring payments; every purchase is a one-off purchase.

§ 3 Requirements for a purchase

(1) A certificate can only be bought if (a) a user account exists, (b) the vehicle concerned is connected to that account and (c) the battery history built up meets the quality requirements shown during the order process (“robust”). Only then is the purchase button enabled — you pay only if a certificate can be issued immediately.

(2) You may only connect vehicles you are authorised to access (your own vehicle or your own manufacturer account). You enter your manufacturer account credentials exclusively with the manufacturer; we receive read access to vehicle data only.

§ 4 Conclusion of contract

(1) The presentation of the certificate on the website is not a binding offer but an invitation to place an order.

(2) The order process: at checkout you confirm, using two separate tick boxes that are not pre-ticked, (a) that you have read these terms and the withdrawal policy and (b) your express request for immediate performance together with your acknowledgement that this ends your right of withdrawal (§ 7). By clicking the “Order with obligation to pay” button you submit a binding offer and are forwarded to our payment service provider Stripe.

(3) The contract is concluded when our confirmation reaches you by email, at the latest when the certificate is supplied. The confirmation contains the content of the contract, the version of these terms, the withdrawal policy and the wording of the declarations you made at checkout (durable medium, § 312f BGB).

(4) The language of the contract is German. We store the text of the contract; you receive the details relevant to you with the contract confirmation.

§ 5 Prices and payment

(1) The total price shown during the order process applies. All prices include statutory VAT.

(2) Payment is handled by the payment service provider Stripe using the payment methods offered there. The price is due when the contract is concluded.

§ 6 Supply of the certificate

(1) The certificate is created and supplied automatically as soon as payment is received; you gain access through your account and by email.

(2) The verification page of the certificate remains available for permanent authenticity checks for as long as we operate the service. If the contract is effectively unwound (for example withdrawal or refund), the certificate becomes invalid and is marked as withdrawn on the verification page.

§ 7 Right of withdrawal

(1) Consumers have a statutory right of withdrawal. The withdrawal policy and the model withdrawal form apply; a withdrawal function is also available there.

(2) For digital content the right of withdrawal expires early once we have begun performance after you expressly agreed that we begin before the withdrawal period expires, acknowledged that you thereby lose your right of withdrawal, and we provided you with the contract confirmation pursuant to § 312f BGB (§ 356 (5) BGB). You make these declarations at checkout (§ 4 (2)); because the certificate is supplied immediately after payment is received, the right of withdrawal therefore regularly expires upon supply.

§ 8 Nature of the certificate; no guarantee

(1) The certificate presents a methodical estimate of the battery’s state of health (usable capacity) based on the vehicle data supplied through the manufacturer’s interface. The underlying methodology and its version are stated in the certificate and disclosed at akku-brief.de/en/methodology; estimation uncertainties (confidence range) are shown in the certificate.

(2) The certificate is not a technical expert report, not a vehicle inspection and not purchase advice; it does not replace an on-site examination. It contains no guarantee or assurance about the future condition, the future development or the remaining service life of the battery, and it does not establish an agreed quality for a vehicle sale contract between third parties.

(3) The basis is the data supplied by the vehicle and the manufacturer. We do not warrant that this data is correct; the methodology detects and filters out obviously faulty data wherever possible.

§ 9 Rights of use in the certificate

(1) You may use the certificate (verification page, PDF, preview image) for your own purposes, in particular share it with prospective buyers and embed it in vehicle listings. The verification page is publicly accessible for this purpose.

(2) You may not alter the content of the certificate, remove signature or methodology details, or use it for a vehicle other than the certified one.

§ 10 Customer obligations

(1) Your details (in particular your email address) must be correct; the email address must be reachable for contractual communication.

(2) You may not manipulate the vehicle data underlying the certificate or obtain a certificate by deceiving us about your authorisation to access the vehicle. We may suspend accounts in cases of misuse; statutory claims remain unaffected.

§ 11 Availability; dependence on manufacturer interfaces

(1) The free service (§ 2 (1)) is operated with reasonable care; there is no entitlement to uninterrupted availability.

(2) Building up the battery history requires the manufacturer to supply vehicle data through its interface. The scope, frequency and availability of these interfaces are outside our control. If the data is not sufficient, no certificate is offered for purchase (§ 3 (1)); amounts already paid are unaffected, because payment is only possible once a certificate can be issued.

§ 12 Warranty

The statutory warranty rights for digital products apply to the certificate (§§ 327 et seq. BGB). Because the certificate is supplied once, we owe updates only as required by § 327f BGB for the relevant period; we do not owe a continuous recalculation of the certificate. The technical availability of the verification page is governed by § 6 (2).

§ 13 Liability

(1) We are liable without limitation for intent and gross negligence, for damage arising from injury to life, body or health, and under the Produkthaftungsgesetz (German Product Liability Act).

(2) In cases of ordinary negligence we are liable only for the breach of material contractual obligations (obligations whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely), limited to the foreseeable damage typical for this type of contract.

(3) Liability is otherwise excluded. Liability under § 8 (no guarantee) remains unaffected.

§ 14 Data protection

Information on the processing of personal data is set out in our privacy policy.

§ 15 Final provisions

(1) The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods. In relation to consumers this choice of law applies only in so far as it does not deprive them of the protection of mandatory provisions of the law of their country of habitual residence.

(2) We are neither willing nor obliged to take part in dispute resolution proceedings before a consumer arbitration board (§ 36 VSBG).

(3) Should individual provisions of these terms be invalid, the remainder of the contract stays in force; the statutory provisions take the place of the invalid provision.