Using a rechargeable power bank as a substitute for lithium-polymer (LiPo) batteries in drones is generally not advisable for several reasons. Here’s a comparison of why LiPo batteries are typically preferred over power banks for drone applications:

1. Energy Density:

• LiPo Batteries: LiPo batteries have high energy density, which is crucial for drones to achieve longer flight times while keeping the weight low. They are designed to provide high discharge rates needed for drone motors and electronics.
• Power Banks: Power banks are designed primarily for charging smaller devices like smartphones and tablets. They generally have lower energy density compared to LiPo batteries and are not optimized for the high discharge rates required by drones.

2. Discharge Rates:

• LiPo Batteries: LiPo batteries can handle high discharge rates, which is essential for drones that require bursts of power for takeoff, maneuvering, and sustained flight.
• Power Banks: Power banks are not designed to deliver high discharge rates. They are intended for slow, steady discharge to charge devices, which is inadequate for the dynamic power demands of a drone.

3. Form Factor and Weight:

• LiPo Batteries: LiPo batteries are available in various shapes and sizes, allowing for a compact and lightweight design that fits into the drone’s frame.
• Power Banks: Power banks are typically bulkier and heavier, which can negatively impact the drone’s performance and flight time. The form factor of power banks is not optimized for drone integration.

4. Voltage and Capacity Matching:

• LiPo Batteries: LiPo batteries are available in configurations that match the specific voltage and capacity needs of drones. They are designed to work with the drone’s power management system.
• Power Banks: Power banks are usually designed to output a fixed voltage (e.g., 5V or 9V) and may not match the voltage requirements of the drone’s electronic components and motor systems.

5. Battery Management:

• LiPo Batteries: LiPo batteries often include or are used with Battery Management Systems (BMS) that ensure safe charging, discharging, and balancing of cells.
• Power Banks: Power banks are equipped with their own battery management systems, but they are not tailored to the specific needs of drone power systems, such as high discharge and precise voltage requirements.

Summary:

• LiPo Batteries: Ideal for drones due to their high energy density, ability to handle high discharge rates, and compatibility with drone power systems. They are lightweight and available in various sizes to fit specific drone designs.
• Power Banks: Not suitable for drone applications due to their lower discharge rates, bulkier size, and fixed voltage output. They are designed for slow, steady discharge rather than the high power demands of drones.

For optimal drone performance, it’s best to use LiPo batteries specifically designed for drone use. They are engineered to meet the high power and energy density requirements essential for effective and safe drone operation.