Recently got a new bike with Ultegra Di2. Tried to go for a ride yesterday and battery completely dead. It was full just last week. I was doing some configuration changes to the set up a few days prior via the E-Tube app and didn't hit the "disconnect Bluetooth LE" button on my phone when I finished. Is this what caused the battery to discharge? I have the Shimano wireless transmitter installed (EW-WU111 i believe). I just assumed the Di2 controller would turn off transmitting via the WU-111 automatically but maybe not?

This is all getting so complicated...