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The philosophy behind our concept is to hide the battery and let it be a natural part of the design on the bicycle. The electric bicycle looks like a normal bicycle and works like one when the power is off. All our batteries are easily removable for recharging. Internal batteries inside the frame have been available for some years. But these batteries have been fixed inside the frame. That means the user has to carry the complete bike for recharging. Thats why our philosophy is: ALL batteries must be easily removable. This concept has been patented. Some clients have a license fee agreement with Protanium to adopt this system.