Just a quick update on the sub battery thing. I had thought my sub battery would work ok with out the battery cover in place (since my was obscenely tight and always impossible to take off). Turns out I was wrong. My friend just 3D printed me a battery cover that was just ever so slightly smaller so it didn't sit so impossibly tight, and now I don't get those sub battery messages. I did not realize the battery cover applied that much pressure.