I have removed the battery and now my external dock only works partially. I can still use my external mouse, keyboard and speakers. But everything related to high-troughput does not work:
I’ve tried standalone mode with no success. Any tips?
Did you install an RTC battery?
No. I can understand why it is needed for maintaining clock accuracy, but for using an external monitors?
Some settings need power to be remembered, sounds like that effects using external monitors, I don’t know why.
A reboot will remember clock/time, but doesn’t seem to work for external monitors.
This RTC battery is useful when using the Mainboard standalone without a main battery, enabling you to preserve your system clock and hardware state.
Emphasis mine.
I suggest you try an RTC battery. Alternatively, you could reconnect your main battery, at least until you get an RTC battery.
Don’t shoot the messenger.
Update: I have a battery again and the external dock works. It behaves a little different now, but could also be a kernel update. Its weird that external peripherals require either a normal battery or an RTC battery.