Can I Replace LiPo Batteries with 18650 Li-ion Cells in an RC Plane?

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

Answer: You can use 18650 Li-ion cells in an RC plane, but there are important considerations. LiPo batteries are preferred for RC planes because they deliver high current and are lightweight. 18650 cells typically have lower discharge rates and are heavier, which can affect flight performance and motor power.

To use 18650 cells safely, first check the continuous discharge rating (CDR) to ensure it meets your motor’s current demands. Next, arrange enough cells in series and parallel to match the voltage and capacity of your original LiPo pack. Use a proper battery management system (BMS) for balancing and protection, as 18650 cells need careful charging and discharging to avoid damage.

Also, consider the added weight and size, which may reduce flight time and agility. If you decide to proceed, test your plane on the ground to verify motor response and monitor battery temperature carefully. Overall, 18650 cells can work but require careful setup and may not perform as well as LiPo batteries designed for RC use.