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 it’s possible to use 18650 Li-ion cells in an RC plane, they are generally not ideal replacements for LiPo batteries. LiPo batteries deliver high current output and have a lightweight, flat form factor that suits RC planes well. In contrast, 18650 cells are cylindrical, heavier, and have lower continuous discharge rates, which may limit your plane’s performance and flight time.

If you want to try 18650 cells, follow these steps:
1. Check the total voltage needed by your plane and connect enough cells in series to match it (e.g., 3.7V per cell nominal).
2. Ensure the cells can safely provide the required current without overheating—check their continuous discharge rating.
3. Use a proper battery management system (BMS) to balance charging and protect the cells.
4. Secure the cells firmly to avoid movement during flight.
5. Test the setup on the ground to monitor temperature and performance before flying.

Overall, LiPo batteries remain the best choice for RC planes due to their weight, shape, and power delivery.