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Some time ago, i powered a NodeMCU with a 9 volt battery, it worked but the next time i tried to use the board, only a little orange led near the usb connector and reset button turned on. I can't interact with it so i think that i applied too much voltage. Please help me if you know what happened and if i can solve it.

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    How did you connect it? Do you know if the battery is flat or not? (9V batteries have almost no capacity) – Majenko May 8 at 10:50
  • @Majenko I connected positive to vin and negative to GND. I used that classic square prism batteries (6LR61 model) – FabioPolanco May 8 at 16:28

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