It should work normally without any special configuration. The USB Vbus and battery connector share the same regulator. What code are you running with the WisBlock? Can you run a simple LED blinking?
If that is for all 4 unit, I am thinking that the voltage is not going to the module. Can you check the voltage on the header pins if you can detect any when you are using the external power source? It might be the wires/cable going to the module causing it?