Here is a short video on how I build a 1s 21700 battery for a Nanolongrange FPV drone. I prefer spot welding over soldering, it is way more robust. Compared to 18650 you will get a slightly longer flight time. In the last third of your flight you will experience a stronger decrease in performance as the weight of the bigger cell makes the drone about 20% heavier.
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![](https://i.ytimg.com/vi/Cp-aaQLBS-o/maxresdefault.jpg)