4 ms·

I can see it uses 3.7V/400mAh battery, but whats the actual battery life?

• 542458 3y ago
  AliExpress reviews seem to say 12h or so with all the power saving features turned on. Without the power-saving... An ESP32 draws 90-240ma when active, and I'm sure the battery capacity is significantly overstated, so if you just flash a simple Arduino sketch it'll probably drain the battery in under an hour.
  • Panzer04 3y ago
    That seems like an excessive amount of power. Does the running program/OS just have zero power saving consideration given?
    • DrFlipper 3y ago
      That would be while the radio is active. I would expect 30-50mA with the radio off, 1-3mA with automatic light sleep enabled (the CPUs will automatically enter and exit light sleep as required, even with WiFi connected), and 5uA in deep sleep. Cheap boards like this may use external components (eg. voltage regulator, LoRA) that add tens of milliamps in quiescent currents, but a well-designed ESP32 device can achieve impressively low power.