All Electric Vehicles (EV) have an algorithm to determine the strength of the battery. Unlike a petrol car, half a tank means half a tank. For Electric Scooters, the controller has to calculate the following: the estimated weight of riders, uphill or down hill road, speed, the terrain of the road and of course the distance the e-scooter has travelled to determine how many bars the LCD will display.
Most people will find that the frequency of charging over a period of time increases. For example: when the battery is new, they charge once every 2 weeks, then once a week, twice a week, once a day and so forth. A typical sign of a failing battery is that once the owner unplugs the charging cable (at whatever level), the number of bars literally drops on the display panel.