Can I Replace LiPo Batteries with Li-ion 18650 Cells in an RC Plane?

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

Answer: Li-ion 18650 cells can be used in an RC plane, but they differ significantly from LiPo batteries. LiPo batteries deliver high current bursts and have a flat discharge curve, which suits the power demands of RC planes. 18650 cells typically have lower continuous discharge rates, so first check the current draw of your motor and electronics. If the 18650s can supply enough current safely, they are a viable option.

To use 18650 cells, follow these steps:

  1. Choose high-quality 18650 cells with a continuous discharge rating matching your plane's needs (often 10-20A minimum).
  2. Assemble the cells in series/parallel to match the voltage and capacity of your original LiPo pack.
  3. Use a proper battery management system (BMS) to protect against overcharge, over-discharge, and short circuits.
  4. Ensure the pack is well insulated and secured to avoid damage during flight.
  5. Monitor the temperature during use; Li-ion cells should not exceed 60°C.

Remember, Li-ion packs are generally heavier and less flexible in shape than LiPo, so consider the impact on your plane's weight and balance.

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