The controller box is the computer that operates the cargo bike and is located underneath the baggage carrier. This is where you place the battery. You can see the battery type you have on the underside of the battery. If you have a QWIC battery, then you need this controller box.
|Model battery||BOSSA BLC/BYD|
|Charging in cargo bike possible||No|
|Suitable for cargo bike variant||Big-E, Dog-E, Pro Trike-E|