I have searched and searched and haven't found anything about how the Solo Power Module works. From your picture it looks like the two wires you are talking about pass through to the upper pins on the battery. Typically SCL and SDA are the data and clock lines for the I2C bus... Taking a total WAG here, but I'm thinking that battery voltage and current computations are possibly made inside the battery and sent out as data over I2C? In older versions of the V/C module, they were done within the module and sent to the APM/Pixhawk through dedicated channels (Voltage Measurement, Current Measurement and a Ground). If you are having trouble getting battery telemetry to populate there may be a problem with the I2C bus if my assumptions are correct. One way to test this would be to use Mission Planner and get link with Solo. Then use tuning mode to graph components that use I2C... mx2, my2, mz2 (external compass on the xyz axis)... I2Cerrors might give some insight. You can also check the raw battery data coming in with battery_voltage, battery_current etc... Also, you can sometimes see a voltage value by using a meter on SCL/Ground and SDA/Ground. It should be a value <5 volts. You might be able to isolate the problem using that method... although it's not 100% reliable. The only real way to troubleshoot I2C is with a scope. Again, I haven't found a lot of info on how Solo works (not like with the original Pixhawk and APM anyway) so this is just what I would do if I was having your problem. If I'm just spouting info you already know, sorry... Hope this helps in some way.