FWIW, I cannot find this in the paper Guide that came with my SOK version of the Ali. Nor can I find it in the Guide which someone uploaded to this forum. (Which are not exactly the same.) Although the backlight trick works with my unit, regardless.
The manual sheet included with the Aili Battery Monitor Click on the orange button in the upper right of this screen to get the manual Brief Description of how the Aili battery monitor works. The Aili Battery monitor does its magic by measuring...
diysolarforum.com