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 be used in some RC planes, they are generally not a direct replacement for LiPo batteries. LiPo batteries deliver higher current output and have a flatter discharge curve, which suits the high power demands of RC planes. If you want to use 18650 cells, first check the current draw of your motor and ensure the cells can safely supply that current without overheating or voltage drop. You will need to connect multiple 18650 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 Li-ion cells require careful charging and discharging to avoid damage or safety risks. Also, consider the weight difference; 18650 packs are often heavier, which may affect flight performance. In summary, 18650 cells can work if you build a well-designed pack with suitable current rating, protection, and weight considerations, but LiPo batteries remain the preferred choice for most RC planes due to their power-to-weight advantages.