Using 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: You can use 18650 Li-ion cells in an RC plane, but there are important considerations. LiPo batteries are designed for high current output and lightweight performance, which suits RC planes well. 18650 cells typically have lower continuous discharge rates and are heavier, so you must ensure the cells you choose can safely provide the current your motor and ESC require. Start by checking the continuous discharge rating (CDR) of the 18650 cells. If they meet or exceed your power needs, you can proceed.

Step 1: Determine your plane’s voltage and capacity requirements. 18650 cells are usually 3.7V nominal, so plan your series and parallel configuration accordingly to match your target voltage and capacity.

Step 2: Use a proper battery management system (BMS) for balance charging and protection, as 18650 cells require careful charging and balancing.

Step 3: Consider the added weight and size; 18650 packs are heavier than LiPo, which may affect flight performance and balance.

Step 4: Test the setup carefully, monitoring temperature (keep below 60°C) and performance during initial flights.

In summary, while possible, 18650 Li-ion cells require careful selection, assembly, and testing to safely replace LiPo batteries in RC planes.