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: While it is possible to use 18650 Li-ion cells in an RC plane, there are important factors to consider. LiPo batteries are designed for high discharge rates, which suits the power demands of RC planes. Most 18650 cells have lower discharge rates and may not deliver the bursts of current required, potentially causing performance issues or damage to the battery.

If you want to try 18650 cells, follow these steps: 1) Check the continuous discharge rating (CDR) of the cells to ensure it meets or exceeds your plane's motor current draw. 2) Assemble cells in a proper series and parallel configuration to match the voltage and capacity of your original LiPo pack. 3) Use a suitable battery management system (BMS) for safe charging and balancing, as 18650 cells require careful monitoring.

Keep in mind 18650 packs tend to be heavier and bulkier, which can affect flight characteristics. For most hobbyists, sticking with LiPo is simpler and safer, but if you prioritise longevity and safety and can manage the assembly, 18650 cells can be an alternative.