Can you please verify which type and brand of battery you are using? If easier, you can send a picture.
Please follow the steps below to test the headlamp:
1. Remove the battery cap.
2. Use a clean cloth to wipe the threads on the light.
3. Take a look at the battery cap to ensure spring is properly settled.
4. Install the battery and fully tighten the battery cap.
5. Connect the USB cable directly to a computer USB port (to rule out an adapter issue)
Does the blue indicator blink rapidly, slowly or stay steady? If it blinks slowly, let the light charge for 6 hours and test it again.