BatMonitor — Privacy Policy

Summary

BatMonitor is a battery monitoring application that connects to compatible Battery Management Systems (BMS) over Bluetooth Low Energy (BLE).

BatMonitor does not require user accounts and does not operate its own servers for storing battery information.

Battery names, Bluetooth identifiers and saved battery readings are stored locally on your device. BatMonitor does not intentionally transmit your BMS readings or battery information to its developer or advertising providers.

The Android version includes third-party advertising provided by the advertising network Adsterra, served via bicea.org. Loading advertisements may involve the processing of technical information such as your IP address and browser or device information, as described in Adsterra's own privacy policy.

The iOS version does not include third-party advertising.

1. Data Controller

The developer and controller of the personal data processed directly by BatMonitor is:

andyechc

BatMonitor is an independent personal project. It is not operated by a company and has no appointed Data Protection Officer.

For privacy-related questions, requests or concerns, you can contact the developer through:

• Project website
• Public GitHub repository

BatMonitor is not affiliated with any BMS manufacturer.

Third-party services mentioned in this policy operate under their own privacy policies and are responsible for the data processing they independently perform.

2. Scope

This policy applies to:

• BatMonitor for Android.
• BatMonitor for iOS.
• The official BatMonitor download website.

It does not cover:

• BMS manufacturers' firmware, hardware or cloud services.
• Third-party distribution platforms such as Uptodown.
• GitHub's hosting and distribution services.
• Adsterra's advertising services (served via bicea.org).
• Apple or Google services and operating systems.

These services are governed by their respective privacy policies.

3. Data Processed by BatMonitor

3.1. Information Stored Locally

When you add a battery, BatMonitor stores the following information in the application's private storage:

• The name assigned to the battery. By default, this may be the name advertised by the BMS.
• The Bluetooth identifier (UUID) required to reconnect to the selected BMS.
• The date the battery was added.
• The last received battery reading, including state of charge (SOC), voltage, current and reception date/time.

Storage mechanisms:

• Android: SharedPreferences.
• iOS: UserDefaults.

This information is stored locally and is not transmitted to the developer's servers.

3.2. Live BMS Information

When connected to a compatible battery, BatMonitor communicates with the BMS through Bluetooth Low Energy.

Depending on the BMS model and supported protocol, the application may read:

• Total battery voltage.
• Charging and discharging current.
• Remaining and nominal capacity.
• State of charge (SOC).
• Battery cycles.
• Individual cell voltages.
• NTC sensor temperatures.
• Active protection states.
• Charge and discharge switch (FET) states.
• Cell balancing status.
• Number of cells and temperature sensors.
• BMS firmware version.
• Date and time information reported by the BMS.

This information is displayed locally.

Except for the last reading described in section 3.1, live readings are not permanently stored by BatMonitor.

BatMonitor does not transmit BMS readings to its developer or advertising providers.

The application may also send supported control commands to the selected BMS over Bluetooth, such as changing its name, enabling balancing, clearing protections or controlling charge and discharge switches.

These operations are performed through the local Bluetooth connection.

3.3. Bluetooth Discovery Information

When searching for nearby batteries, BatMonitor temporarily processes information advertised by discovered Bluetooth devices, including:

• Advertised device name.
• Bluetooth identifier.
• Received Signal Strength Indicator (RSSI).

Discovery results are kept in memory during the scanning process.

Only the battery selected by the user is saved, according to section 3.1.

3.4. Application Update Checks (Android Only)

When the Android application starts, BatMonitor performs a GET request to:

https://andyechc.is-a.dev/batmonitor/api/version.json

This request checks whether a newer application version is available.

The request does not intentionally include:

• Your battery names.
• Your BMS readings.
• Your Bluetooth identifiers.
• Your account information.
• Your installed application version as a user identifier.

The hosting infrastructure (GitHub Pages and its associated delivery infrastructure) may automatically process standard technical information associated with an HTTPS request, such as IP address, request date/time and User-Agent.

This communication is used exclusively to retrieve the version manifest.

The iOS application does not perform this update check.

3.5. Information BatMonitor Does Not Collect

BatMonitor does not implement its own collection of:

• User accounts or registration information.
• Names, email addresses or telephone numbers.
• Contacts.
• Photos, videos or personal files.
• Microphone or camera recordings.
• GPS coordinates or precise location.
• Android Advertising ID or Apple's Identifier for Advertisers (IDFA).
• Health or financial information.
• Cross-application browsing activity.
• Analytics or audience measurement.
• Its own crash-reporting or behavioral tracking service.

This statement concerns data collection implemented directly by BatMonitor. It does not cover information independently processed by third-party services described in this policy.

4. Permissions

BatMonitor requests only permissions needed for its functionality.

Android

Bluetooth scanning and connection

Used to discover compatible BMS devices and communicate with the battery through Bluetooth Low Energy.

Depending on the Android version, the operating system may require:

• Bluetooth scan and connection permissions.
• Nearby Devices permission.
• Location permission for Bluetooth discovery on older Android versions.

Although some Android versions require a location permission to perform Bluetooth scanning, BatMonitor does not use GPS or location APIs to determine or store your physical location.

Internet

Used exclusively for:

• Checking application updates.
• Loading third-party advertisements through the advertising network Adsterra (bicea.org).

iOS

Bluetooth

Used by CoreBluetooth to discover and communicate with compatible BMS devices.

BatMonitor does not request camera, microphone, contacts or location access.

Bluetooth access is necessary for the application's primary battery monitoring functionality.

5. Data Retention, Backups and Deletion

Battery information remains stored locally until you remove it or uninstall the application.

You can delete a saved battery directly from BatMonitor. This removes its locally stored name, Bluetooth identifier and last saved reading.

Uninstalling BatMonitor removes its application data from the device, subject to the operating system's backup and restoration mechanisms.

Please note:

Android backups

Depending on the application's backup configuration and your device settings, locally stored information may be included in Android backups.

iOS backups

Depending on your device configuration, UserDefaults information may be included in iCloud or device backups.

System backups are governed by the respective platform providers' policies.

Deleting information from your device does not necessarily remove copies already included in an existing backup.

BatMonitor does not maintain a separate central database of your battery information.

6. Purposes and Legal Basis

BatMonitor processes information for the following purposes:

Providing the application's functionality

Locally storing battery configurations and communicating with your selected BMS to provide battery monitoring and supported control features.

Application maintenance

Checking for newer Android versions to help users keep the application updated.

Advertising

Displaying advertisements in the Android application through the advertising network Adsterra (served via bicea.org). The official download website does not display advertisements.

Advertising is not based on your battery readings, battery names or BMS information.

Where applicable privacy laws require consent for advertising-related storage or access to device information, the relevant consent requirements must be respected by the responsible service providers.

The applicable legal basis may vary depending on your jurisdiction and the specific processing activity.

7. Third-Party Advertising — Adsterra (bicea.org)

The Android version of BatMonitor integrates third-party advertisements provided by the advertising network Adsterra, served via bicea.org.

Advertisements are displayed through a dedicated Android WebView using the provider's advertising integration, including a 320x50 iframe banner format and a native banner format.

The official BatMonitor website does not display advertisements.

When an advertisement is requested or displayed, the WebView communicates with Adsterra's infrastructure through bicea.org.

Adsterra's services may process technical information including:

• IP addresses.
• Browser and device information.
• Cookies and similar storage technologies used to serve and measure ads.

For more information, consult Adsterra's privacy policy at:

adsterra.com/privacy-policy

BatMonitor does not intentionally provide the advertising network with:

• Battery names.
• Bluetooth identifiers.
• BMS readings.
• Saved battery configurations.
• User accounts or personal registration information.

The developer does not control Adsterra's independently performed data processing, retention periods or advertising operations.

For questions or requests concerning information processed directly by Adsterra, users should contact Adsterra through its own privacy channels.

Important: Disabling your internet connection prevents new online advertising requests while the device remains offline. It does not delete information that may have already been processed by Adsterra (served via bicea.org) or other third parties.

The iOS version does not integrate third-party advertising.

8. Other Third-Party Services

BatMonitor relies on certain third-party services for distribution and hosting.

BatMonitor does not sell users' battery information or share BMS readings with these services.

The developer does not control the independent data processing performed by these providers.

9. Official Download Website

The official BatMonitor website is a static website hosted through GitHub Pages.

It does not provide:

• User registration.
• User accounts.
• Contact forms.
• User-submitted battery information.

The hosting infrastructure may automatically process standard technical information associated with website visits, including IP addresses, request timestamps and browser information.

The website does not display third-party advertisements.

BatMonitor does not implement its own website analytics or tracking cookies.

10. Your Privacy Rights

Depending on the privacy laws applicable to your location, you may have rights concerning your personal information, including:

• Access.
• Rectification.
• Erasure.
• Restriction of processing.
• Data portability.
• Objection to certain processing activities.

For information stored locally by BatMonitor, you can exercise practical control directly through the application by removing saved batteries or uninstalling the application.

For information independently processed by Adsterra, GitHub, Uptodown, Apple or Google, you should contact the respective provider through its privacy channels.

For questions about data processing directly performed by BatMonitor, you can contact the developer using the channels listed in section 1.

Where applicable, you may also lodge a complaint with the data protection authority responsible for your jurisdiction.

11. Security

BatMonitor uses the operating system's private application storage to keep locally saved battery information.

Network communications for Android version checks and third-party advertising use HTTPS where supported by the respective services.

Battery monitoring and supported BMS control operations are performed through a local Bluetooth connection.

Because BatMonitor does not transmit BMS readings to its developer, it does not maintain a central database of users' battery information.

However, no electronic storage or communication method can be guaranteed to be completely secure.

Users should also protect their devices and associated cloud backup accounts using appropriate security measures.

12. Children

BatMonitor is designed for people who own or operate compatible BMS-equipped batteries.

It is not specifically directed at children.

The developer does not knowingly collect personal information from children through BatMonitor.

Third-party advertising services may apply their own age-related restrictions and privacy requirements.

13. Changes to This Policy

This policy may be updated when application functionality, integrations, third-party services or applicable privacy requirements change.

Material changes will be published at this same URL, with the revision date and version updated accordingly.

Users are encouraged to review this policy periodically.

14. Contact

For questions, privacy concerns or requests relating to BatMonitor's own data processing, contact the developer through:

• GitHub Issues
• Official project website

Please avoid including unnecessary personal or sensitive information in public GitHub issues.

For matters concerning data independently processed by third-party services, please contact the relevant provider directly.