FR is not expected to work without battery. That's technically impossible basically. GSM will take >2A in spikes, and usb can deliver max 500mA, from wallcharger FR may accept up to 1A. As soon as system power consumption gets higher than what USB can deliver, FR is powering down of course. The issues you mentioned were about ability to charge an empty battery, just *because* you need a certain amount of power from bat while booting/operating the device.
Probably your assumption about charge state of bat were incorrect, and bat simply run flat so FR stopped working. Please refer to wiki about "(empty) battery" /j
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