Please help

[Exxteban]

Hello friends, i have a esp32 Wroom DoIt DevKit v1 with a Ds18b20, to which I connect to the computer's USB and send the information in this case to ThinkSpeak the temperature without any problem, but when connecting to the VIN pin and the GND of the LiFePo4 battery, it turns on the Red Power LED, but does nothing, not even the wifi connects, does not send the temperature, does nothing, just turns on, but by the USB if you send the data to Thinkspeak, I do not understand what the problem may be.

I have 2 Esp32 same and the same happens to me with both.

[mikemoy]

When you disconnect the USB cable and plug in the battery then press reset does it then work ?

[Ristridin]

What is the battery voltage. If 5V or higher: connect to Vin. If 3.3V, connect to 3V3