Drone flying time is very limited and most of the drones have average 15-30 minutes flying time. The most common reasons why batteries on drones are so short is that motors that drive drones require a lot of energy. Cheap drones can fly only for 5 -10 minutes. Secondly, when energy is transferred in to or out of these batteries, heat is generated. Heat is a wasted energy from the batterie, and it is not good for battery because it reduces battery cycle life.
When choosing a battery for the Drone, the main thing we should look at are features such as capacity, safety, long duration and price. Batteries can have a long life characteristics, high capacity, high power, deep discharge, quick charge or other defined parameters. What’s important is battery capacity. Drones should choose the best battery that can store the most energy per unit of mass (Wh/kg). Lithium is the lightest of all metals, has the highest electrochemical potential and offers the highest specific energy by weight.