The ST2 opens up new dimensions with its operating range. Thanks to an even more efficient motor and a larger battery, you can now cover up to 180 kilometers before your ST2 will need fresh energy. The lithium-ion battery is housed discreetly in the down tube of the frame. You can choose where and how to recharge the battery of the ST2. It can either be charged inside the frame via an external charging socket or the energy storage unit can simply be removed from the frame and recharged wherever you wish, using a charger. In recuperation mode, you actually generate energy when you brake; that energy is then fed back into the battery.