At the end of 2015, we started a large drone, adding a more than 5,000 mAh battery, priced at nearly 1,000, and the price of the 20000 mAh we usually use is one or two hundred yuan. Why is the difference so great? ? Isn't it even longer to use a 20000 mAh rechargeable battery to run on a drone?
 
Simply put, the main reason is that the power battery used by the drone is different from a normal battery in that it can instantaneously discharge a large current and meet the demand for a large power change in a short time. Therefore, prices have to rise straight.
Are lithium batteries Why drone batteries are so expensive?
The first is performance. The drone needs to overcome its own gravity to do work. Therefore, the weight requirement of the battery is higher, and increasing the battery capacity will result in an increase in weight. Therefore, only the polymer lithium ion battery with lighter weight is used in the same capacity. Can meet the needs, on the other hand, drones for the battery power requirements are particularly high, when the hover from the state to quickly increase the throttle to the maximum speed, the battery power will quickly increase, a few times the power in a short time increases, such power Only the polymer lithium-ion battery can meet the changes. In fact, the 18650 battery can meet this requirement through series and parallel connection. The Tesla car's battery is a series of more than 7000 18650 battery strings, which can withstand the instantaneous high-power demand. This is obviously not suitable for drones. Therefore, from a performance point of view, only polymer lithium-ion batteries can meet such use requirements.

Of course, even if the polymer lithium-ion battery is very quickly depleted on the drone, Dajiang Elf 4 a 5800mah battery, containing as much as 89Wh of energy, a 20000mah charging treasure generally contains only 70Wh of energy, and Such a 5800mah battery can only support the flight time of 30 minutes, you can imagine how much pressure on the battery, polymer lithium-ion battery in this working environment for a long time, the battery loss is very fast, and rapid discharge in a short time can also lead to The rapid increase in battery temperature, which makes the drone battery needs further protection.

Dajiang’s drone batteries are called smart flying batteries because, in addition to the polymer lithium-ion battery, the battery has more components. First of all, in order to protect the long-term safety of the battery, the power management system can charge and discharge the battery, and it can always keep the battery in a safe range. Secondly, if the battery is left fully charged for a long time, it will have an impact on the battery life. The DJI smart battery has built-in battery self-discharge protection, which automatically discharges when it is left for a long time, extending the battery life. This set of technologies is a bit like the lite version of Tesla's power management system.

Therefore, whether it is from the perspective of performance or safety, the battery requirements of UAVs are higher than those of 18650 batteries used in ordinary charging treasures, which also makes them expensive.