Ok, that 9v module didn't work, I'm guessing that it isn't supplying enough current as I get the flashing battery light.
I got a Powerboost 1000c but I'm having a lot of trouble; it only seems to be capable of starting the lynx about 10-20% of the time, it's infuriating, the rest of the time the screen (McWill) just shows garbage, once it starts it stays running happily. Whether the batteries are connected or it's running off usb it's the same behaviour.
I made the power wires thicker and it worked for a while(on the bench), but then when I popped it into the lynx and tidied up the wires it went back to its old ways.
I'd appreciate any thoughts you might have, ask me questions, I feel like I'm missing something here.