As written in the title my Teensy 4.1 is not running on external power. I have a 3.7 Volts LiPo-Battery. I connected VBatt+ from the battery to the VIN pin on the top right corner og my teensy and afterwards i connected GND to GND. But the LED which is supposed to blink (which it does when i connect the teensy to my computer with MicroUSB) does not blink. I also took 3 AA-Batteries and connected them in series. Then again i connected + of the batteries to the VIN pin and afterwards GND to GND but with the same result that the LED is not blinking. I measured the voltage on the pins of my teensy and had 3.72 Volts with the LiPo-Battery and 4.52 Volts with the 3 AA-Batteries. I then did a little research and but the CPU-Speed from 600 Mhz down to 24 MHz, because in a thread referring to the Teensy 2.0 i red that the Microcontroller only runs at a Speed below 16 MHz (highest for Teensy 2.0) when running on 3.3 Volts. But that also didn't do the trick. Any thing i am missing here? Anyone has any advice? Thanks in advance!