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

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Question: Can I use Li-ion 18650 cells instead of LiPo in an RC plane?

Answer: While 18650 Li-ion cells can power an RC plane, they are generally not a straightforward replacement for LiPo batteries. LiPo packs offer higher discharge rates (C-ratings) needed for the high current draw of motors, whereas 18650 cells typically have lower maximum continuous discharge currents. If you want to use 18650 cells, follow these steps:

  1. Check your motor and ESC current requirements, ensuring the 18650 pack can safely supply that current without overheating.
  2. Build a battery pack by connecting multiple 18650 cells in series and parallel to match the voltage and capacity of your original LiPo pack.
  3. Use a proper battery management system (BMS) for balancing and overcharge/discharge protection, as 18650 cells require careful monitoring.
  4. Test the pack under load and monitor temperature; if cells get hot, the pack may not be suitable.
  5. Consider the extra weight, as 18650 packs are often heavier than LiPo equivalents, which can affect flight performance.
  6. Always use a charger designed for Li-ion cells, not LiPo chargers.

In summary, 18650 cells can work but require careful assembly, protection, and may compromise performance compared to LiPo batteries designed specifically for RC applications.

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