I would like to know if you see this battery percentage value exactly in the E-scooter I/O tab of the configurator.
Also, have you checked what battery percentage values are sent to the server? If you have not, please change the priority of this I/O parameter to Low or High to include it in the sent records.
Moreover, I would appreciate it if you could specify the firmware version of your TFT100 device.
Additionally, have you tried connecting your device to another e-scooter if you have more of them?