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 deliver high current with a flat discharge curve, ideal for the bursts of power RC planes need. 18650 cells typically have lower discharge rates and higher weight, which can affect performance and flight time.
Step 1: Check the current draw of your motor and electronics. Ensure the 18650 cells you choose have a continuous discharge rating that meets or exceeds this.
Step 2: Arrange enough 18650 cells in series and parallel to match the voltage and capacity of your original LiPo pack. Remember, a 3.7V nominal 18650 cell is lower voltage than a typical 3.7V LiPo cell, which is actually 3.7V nominal but can deliver higher current.
Step 3: Use a proper Battery Management System (BMS) for charging and balancing the 18650 cells, as they require different charging protocols than LiPo.
Step 4: Test carefully for heat and voltage under load. If the pack gets too warm or voltage drops significantly, it’s not suitable.
In summary, 18650 cells can work but usually require more careful design and may lead to heavier and less responsive power delivery compared to LiPo batteries.
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