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 batteries in an RC plane?

Answer: You can use 18650 Li-ion cells in an RC plane, but there are important considerations. LiPo batteries are popular because they deliver high current and have a flat discharge curve, which suits the demands of RC planes. 18650 cells typically have lower discharge rates, so first check the current draw of your motor and electronics to ensure the cells can supply it safely without overheating.

To use 18650 cells, connect multiple cells in series and parallel to match the voltage and capacity of your original LiPo pack. Use a proper battery management system (BMS) designed for Li-ion cells to handle balancing and protection, as Li-ion chemistry requires different charging and discharging protocols than LiPo.

Also, consider the weight and size differences; 18650 packs may be heavier or bulkier, affecting flight performance. Finally, monitor cell temperature during use to avoid overheating. If you’re new to building battery packs, it’s usually easier and safer to stick with LiPo batteries designed for RC applications.