Privacy Policy

Short version: the calculators run in your browser and we don't store personal data.

Last updated October 2026. By the editorial team.

Calculator inputs stay in your browser and are not sent to us.
We plan to use privacy-friendly analytics (Cloudflare Web Analytics) with no personal data.
If you share a result, the link carries only your calculator answers (such as battery age or a voltage reading) in the address. Your last result is remembered in your own browser so we can say "welcome back"; nothing is sent to us.
Your browser may store a unit or locale preference locally. You can clear it at any time.
The postcode you type in the store finder is only used to open a Google Maps search in a new tab.
If we later add ads or affiliate links, this page will say so.