Can You Use 18650 Li-ion Cells Instead of LiPo Batteries in an RC Plane?

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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 quick bursts of power RC planes need. Most 18650 cells have lower continuous discharge ratings, so make sure to select high-quality, high-drain cells (e.g. those rated for 10A or more). Here’s a step-by-step approach:

  1. Check your plane’s power requirements, especially the current draw of your motor and ESC.
  2. Choose 18650 cells that can safely deliver that current without overheating.
  3. Assemble the cells in series and parallel to match the voltage (usually 3.7V per cell) and capacity you need.
  4. Use a proper battery management system (BMS) for charging and cell balancing, as 18650s require careful charging to avoid damage.
  5. Test the setup on the ground first to monitor temperature and performance.

Keep in mind, 18650 packs are usually heavier and bulkier than LiPo packs with the same capacity, which might affect flight characteristics. For best results, consider LiPo batteries designed specifically for RC use.

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