Keep your scooter on charge doesn't sound right. Usually, eScooters take 3-4 hours for charging and many chargers have a red while charging. These chargers turn the green light on when they completed the charging. Here, you can also read more tips about the take care of your e-scooter or e-bike
https://www.insurance4ebikes.co.uk/looking-after-your-e-bike/. However, according to auto experts battery should be full all the time.
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