I am using S2C modules. I want to give the power of the modules by connecting power bank to the usb explorer board or demo boards. Although the modules are coordinator or router, the modules are going to no power mode after some seconds. It is not the sleep mode, module is not responding when pressing the associate or reset button. What is the problem here? How does xbee module understand that it is connected to a battery and shut down yourself even if it is in a no-sleep mode?