Battery Sayar

Battery Sayar reads a JBD or Xiaoxiang battery management system over Bluetooth and shows the pack while you are connected.

Connect a nearby pack, or turn on auto-connect for the last one you used. You can rename a pack so it is easy to find next time. Disconnect stays disconnected until you connect again or turn auto-connect off and back on.

The home screen shows state of charge, pack voltage, current, power, remaining capacity, full capacity, and cycle count. While the pack is charging or discharging, it shows a time range until full or empty. That range stays steady instead of jumping every second.

Cells lists each cell voltage, the lowest and highest cells, and the gap between them. Temperatures from the pack probes are shown in Celsius or Fahrenheit.

Controls turn the charge and discharge switches on or off. BMS limits let you read and save the pack's own protection settings, including cutoffs, delays, current, temperature, and balance. Those limits are stored on the pack.

Share this pack sends the live reading to other phones on the same Wi-Fi. Those phones can watch voltage, current, charge, cells, and temperature. They cannot change the pack unless you turn on Allow shared phones to send commands. That switch is off by default. Turn sharing off to stop it. Sharing stays on your local network. Battery Sayar has no account and no cloud server.

A live notification can show charge, voltage, current, and time left while you stay connected. Alert levels warn once each time the pack charges or discharges through a level you set.

Devices and Settings can be shown in English or Myanmar. English is the default.

Battery Sayar does not show ads, does not track you, and does not sell data. Settings stay on your phone. The privacy policy is in the app and at https://chanmyaekozin-ucsy.github.io/battery-sayar-privacy/

This app needs a phone with Bluetooth Low Energy and a compatible JBD or Xiaoxiang BMS.