BatterySnap browser extension — Privacy policy

Last updated: 2026-11-09 · Extension: BatterySnap for Chrome, Edge and Firefox · Operator: xelacorp · Contact: xhelas@gmail.com

The extension shows, in your desktop browser, the battery of an Android phone running BatterySnap and of the phones that phone monitors. The BatterySnap Android app has its own privacy policy, which covers how battery data is collected from phones in the first place.

What the extension sends

The extension talks only to https://www.battery-snap.com. It has no account and no password.

• When you connect it to a phone: the 6-digit code shown by the phone, and a name for this browser (by default the browser and operating system, for example “Firefox on Windows”; you can change it). The name is shown on the phone, in its list of connected browsers.
• Every few minutes: a request for the phones' battery state, authenticated by a random token the server gave at connection.

It reads no web page, no browsing history, no tab and no bookmark. It contains no analytics, no ads and no third-party code.

What the server keeps

• For each connected browser: the phone it is connected to, its name, when it was connected and when it last asked for data, and a SHA-256 hash of its token (never the token itself).
• Connection history: for each phone, the dates a connection code was requested and a browser was connected, first asked for data, was paused or resumed, and was disconnected, with the date of its last request at that point. It holds no browser name, no token and no battery data, is used to measure how the extension is used, and is deleted with the phone's record.
• Web server access logs: the requesting IP address, time, URL path, status code and user agent, as for any web request, rotated daily and deleted after 14 days.

Disconnecting a browser revokes its token at once; a revoked browser's record is deleted 30 days later, except for its connection history.

What the extension stores in your browser

Its token, the last battery state of each phone (level, charging, temperature, time left, last update, the names you gave the phones in the app), and your settings (alerts, phone order, names). All of it stays in the browser's extension storage and is erased when you remove the extension.

Disconnecting

On the phone: BatterySnap → Share → Devices monitoring me, then remove the browser; this revokes its token. In the extension, Settings → Disconnect (or removing the extension) deletes the token from the browser, but the phone keeps listing that browser until you remove it there. Without BatterySnap Xtra, a phone's browsers are paused a week after its first browser was connected, and resume once the phone has Xtra again; for this the server keeps the date of that first connection with the phone's record.

Sharing

Nothing is sold, shared or used for advertising. The server runs on our own machine hosted by OVHcloud in the EU, which processes the data only as our hosting provider.

Children

The extension is not directed at children and collects no data about them.

Changes and contact

Changes to this policy are published on this page with a new “Last updated” date. Questions and requests: xhelas@gmail.com.