How we measure

Every number on Battery Mentor is aggregated from real devices running Battery Guru, our companion Android app used by over a million people. We never use lab benchmarks or manufacturer spec sheets.

Reports are submitted anonymously and only after a full charge or discharge session, so each data point reflects genuine everyday use.

We store running population averages per device, not individual sessions. As new reports arrive, each device's battery life, charging speed, screen-on time, temperature and health are blended into a continuously updated mean.

Devices need a handful of reports before they appear in rankings, so a single outlier never skews the results. Where possible we lean on a healthy-battery cohort so comparisons stay fair across device ages.

No accounts, no names, no emails, no location, no advertising IDs. We do not store per-session histories tied to a person, and raw submissions are discarded after they fold into the averages.

The result is a dataset that is useful in aggregate but cannot be traced back to any individual.

Measured stats are encrypted in transit and at rest. The sensitive metrics are sealed in an encrypted blob and only decrypted to render a page, never exposed in bulk.

For the full legal detail, read our privacy policy.