Can You Use 18650 Li-ion Cells Instead of LiPo Batteries in RC Planes?

Question: Can I use Li-ion 18650 cells instead of LiPo in an RC plane?

Answer: While 18650 Li-ion cells can technically power an RC plane, they are generally not recommended as a direct replacement for LiPo batteries. LiPo packs have a higher discharge rate, which suits the high current demands of motors in RC planes. In contrast, 18650 cells often have lower continuous discharge ratings, which may limit performance or cause voltage sag during flight.

If you want to try 18650 cells, follow these steps: 1) Check the continuous discharge rating (CDR) of your cells; it should match or exceed your motor’s current draw. 2) Build a battery pack with the correct series and parallel configuration to achieve the desired voltage and capacity. 3) Use a proper battery management system (BMS) to protect against overcharge, over-discharge, and short circuits. 4) Test the pack on the ground for heat and voltage stability under load before flying.

Remember, LiPo batteries are lighter and designed for high current, so 18650 packs may add weight and reduce flight time. For best results, stick with high-quality LiPo batteries designed for RC use.