Problems with the battery duration

Hi - please can you check and make sure the LCD timeout is low, and only Wake on Button is set in the Bangle's settings?

But as you say this could be related to the Bluetooth connection. Someone asked about this recently and there's a bit of background in https://forum.espruino.com/conversations/399937

But basically when Bangle.js has a bluetooth connection, it goes into a low power low speed communications mode after 1 minute of inactivity, but when something is sent to it or it sends something, it enters the high power mode for 1 minute. If you've got something like a notification from the Android phone that keeps coming in every few minutes, that could kick it into the higher power mode?

To track down you could enable write log in Gadgetbridge on your phone, then dump it out, and look to see how often UART TX/UART RX lines occur normally.

Also in Gadgetbridge, make sure allow high MTU is enabled in the device's settings (I think it's the default) - if the Bangle can send/receive just one packet it won't put itself into the high power mode

If this is the issue I guess it's something we could look at as a firmware update - making the Bangle less willing to put itself into the high power radio mode (like requiring more than 2 packets before it does it)