There are several reasons as follows:
1. Connect the power adapter to the power, but do not connect it to the scooter. Check the LED indicator of the power adapter; if it turns red or does not turn on (green is normal), then the power adapter needs to be replaced.
2. If the battery temperature is too high or too low, the thermometer icon will be on. In this case, the scooter cannot be charged. Charge the scooter after its battery temperature returns to the normal operating range.
3. If the scooter has not been used or charged for a long time, the battery will become over-discharged. Try connecting the charger to see if it can activate the battery. If it cannot be activated, it indicates severe over-discharge, and the scooter needs to be repaired.
4. When the scooter's charging temperature falls below 2 ℃, a low-temperature protection mechanism will activate, preventing charging. This protection deactivates when the temperature rises to 5 ℃. You can check the adapter's indicator light during charging: red means charging, and green means not charging. If the light is green, the scooter is not charging; please move it to a warmer environment before trying to charge again.