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 considerations. LiPo batteries are designed for high discharge rates, which suits the power demands of RC planes. Standard 18650 cells often have lower continuous discharge ratings, so ensure you select high-drain 18650 cells (20A or more) to avoid voltage sag and potential damage. Step 1: Calculate your plane’s current draw and match it with the cell’s maximum continuous discharge rating. Step 2: Arrange enough cells in series and parallel to reach the required voltage and capacity, remembering that 18650 cells have a nominal voltage of 3.6–3.7V compared to 3.7V for LiPos. Step 3: Use a proper battery management system (BMS) for Li-ion packs to prevent overcharge, over-discharge, and balance cells. Step 4: Consider the increased weight and size of 18650 packs, which may affect flight characteristics. Overall, while possible, LiPo batteries remain the preferred choice for their power-to-weight ratio and convenience in RC planes.