Unfortunately, there's no fast-charge capability for the B-Class Electric Drive, which rules out sustained travel along so-called 'electric highways.' The ED can be charged fully in about 3.5 hours, or to 60 miles of range in less than two hours, on 240V. And if you dare charge it on 120V household AC, it takes roughly 30 hours.
While the Range Plus option won’t affect the Electric Drive’s efficiency, it will open up an extra 3 kWh of battery capacity—temporarily raising it to 31 kWh, to allow an added range of approximately ten percent (about 8 miles, although Mercedes-Benz says up to 18 miles under ideal conditions) that aren’t included in the official range figures.
As part of this package, the Electric Drive will also gain an electric windshield and increased thermal insulation in the doors.
The Electric Drive's available Radar-based Recuperation System might also help improve real-world efficiency. With four modes of regenerative-braking behavior (D (Drive), D+, D-, and D-Auto. D-Auto), you can choose the one that best matches your driving style. With the D-Auto mode, you get more regenerative braking when you reach a range of 260 feet to the car ahead. It raises the level of regenerative braking gradually, up to a maximum 100 feet behind that car. There’s also a logic that will automatically raise the level of regeneration on steeper downhills, so as to eliminate the need to dab the brakes at up to an eight percent grade.