When powering on the Omega2 with a battery attached the orange light blinks as it normally does when booting and then goes solid but after some seconds the orange goes off, the blue (the power LED) is still lit up though. The WiFi AP is not showing up "in the air" so the Omega is "dead" for sure. This happens even if the battery is recently charged full (capacity 3.75 when checking it with a multimeter). When attaching it to USB power the Omega boots up and stays booted and the AP shows as well (the battery starts getting charged of course since the charge indicators starts to light up).
Another scenario is if I boot the Omega2 up with the battery attached and using USB power and then disconnect the USB power, the Omega2 continues to operate. But... if I re-attach USB power again, the Omega2 dies (and the orange LED goes off and the AP stops to work). Power LED is still on and if I have anything presented on the attached OLED expansion, it still shows even if the Omega2 is not working so the hardware stack has power coming into it.