Privacy policy

Effective 2026-10-18.

What this site does not do

The calculator runs entirely in your browser. There is no account, no sign-in, and no form that asks for your name, address, email or tariff. The figures you enter stay on your device unless you choose to share them by copying a link that contains them.

What is stored

Nothing you type is sent to a server, and there is no account to attach it to. Your inputs live in the page you are looking at; if you copy a result link, the inputs are visible in that link because that is how the link restores them. Closing the tab discards them.

Analytics

This site uses Google Analytics 4 (GA4) to understand aggregate usage — page views, and which calculator features get used: mode switches, parameter changes, result views, model lookups, link copies and clicks on outbound source links. Those events carry aggregate values only (which field changed and the mode used), never your raw inputs. GA4 is provided by Google and sets cookies (including _ga), transmitting this data to Google. You can block or delete these cookies in your browser settings, or use Google's opt-out browser add-on.

Advertising and cookies

No advertising script is loaded in this build. Third-party advertising networks may set cookies to serve and measure ads. You can block or delete cookies in your browser settings. No advertising script is loaded before approval.

External links

Pages link to official sources such as utility tariffs, regulator decisions and manufacturer specifications. Those sites have their own privacy policies, which we do not control.

Contact

support@batterypayback.net — questions about this policy, or requests to remove anything you believe we hold, are welcome.

This policy may be updated; the effective date at the top reflects the current version.