Can I Replace LiPo Batteries with 18650 Li-ion Cells in My 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 differences to consider. LiPo batteries are designed for high discharge rates, essential for RC planes that demand bursts of power. Most 18650 cells have lower continuous discharge ratings, so first check the cell’s C-rating to ensure it can safely supply your motor’s current.

Step 1: Calculate your plane's current draw and select 18650 cells with a suitable discharge rating.

Step 2: Arrange the cells in series and parallel to match the voltage and capacity of your original LiPo pack.

Step 3: Use a proper battery management system (BMS) for Li-ion cells to balance charging and prevent over-discharge, as Li-ion cells are more sensitive than LiPos.

Step 4: Ensure your charger is compatible with Li-ion chemistry and monitor cells for heat during use.

Remember, 18650 packs tend to be heavier and bulkier, which may affect your plane’s performance and balance. If you prioritise flight time over power bursts, 18650s can be a viable alternative with careful setup.