Trouble powering the TX1 with batteries

I’m looking for a way to power the TX1 from a battery supply, it’s seems like others have been able to do this more or less seemlessly:

However when I try hooking up my TX1 to my 12V batteries, it won’t boot. I’ve also tried putting two batteries in series and dropping the voltage down from 24 to 19V which the TX1 uses natively, still nothing.

Right now I can only power the TX1 with it’s power brick :/.

any help would be very much appreciated!

Did you try pressing power button twice? Maybe you need capture the voltage drop when press power button.