Can I 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 batteries in an RC plane?

Answer: You can use 18650 Li-ion cells in an RC plane, but there are important considerations. LiPo batteries are popular because they deliver high current with low internal resistance, which suits the demands of motors and ESCs in RC planes. 18650 cells typically have lower continuous discharge rates and are heavier, which can affect performance and flight time.

Step-by-step advice:

  1. Check your motor and ESC current requirements. Ensure the 18650 cells you choose can safely supply that current without overheating.
  2. Use a proper battery holder or pack configuration to match your voltage needs. For example, 3 cells in series (3S) provide about 11.1 V nominal, similar to a 3S LiPo.
  3. Include a suitable battery management system (BMS) or protection circuit, as 18650 cells require protection against overcharge, over-discharge, and short circuits.
  4. Test the setup on the ground to monitor temperature and performance before flying.
  5. Expect some weight increase, so adjust your plane’s balance accordingly.

In summary, while 18650 cells can work, LiPo batteries remain the best option for high-power RC planes due to their lightweight and high discharge capability.

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