Possible cause of this issue:
The display is not turning on because the battery is not installed correctly.
See below a few examples of wrong battery installation leading to the display not turning on.

battery installation M1 M1 Battery installation 2

Solution:
In this situation, follow these steps:

  1. Turn off the battery
  2. Remove the battery from the bike
  3. Install it correctly (without any gap or pushing down) and
  4. then turn on the power on the battery.

Please try the above steps and it should resolve the issue.

Side Note: When fully charged, the vertical LED light on the back of the battery turns fully red and the LED light on the charger changes from red (charging) to green (charged).

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The M1 display not turning on despite the battery being fully charged. 1 1
The M1 display not turning on despite the battery being fully charged. 2 0