Drone Battery
#2
Vague question. Do you mean flight duration or the lifespan of the battery? Flight duration depends on the capacity of the battery. The lifespan of the battery depends more on good charge and storage technique. If you are just getting started you are probably better off going with spending the money for a couple of name brand, middle of the road batteries. If you can be more specific about what equipment you are using it will help people to answer your question.