Sure, if you buy an inexpensive bike, there's a chance it has a failure and how do you fix it. In the case of Ecotric, there's a guy right now on the facebook forum that has been shipped a second battery and a second controller. He can't get it working. They'll probably send hm a motor, as they have done that with other customers. Some people just don't have the manual dexterity or understanding to fix their own bike, no matter if they had a box of parts.