Just wanted to put it out there as I wasn't able to find any solid information regarding an issue where my Reuleaux would not turn on / screen would flash then turn off unless I was holding the button.
I had three of these all with the same symptoms.
The issue is in the jumpers they used between the battery balancer and the positive / negative battery connections. Remove those or jump them with piece of wire and all is well. I spent hours and hours on this so just wanted to share.