Welcome to the forum.
As you may be aware the range of the E RIDER is not a precise measurement and depends on many factors including the terrain and the body weight of the rider. Many of our customers who use their E RIDER to commute purchase a spare charger which they keep at work. They then charge the battery while they are working so they have a full charge for the return journey.
Doing this will also improve the longevity of the battery rather than running it down to flat too often.