Whether you fly a drone or RC plane, using a lithium-ion battery instead of a lipo can give you more flight time and, if you build your own, even save you money. In this video I build a 6S Li-Ion battery using 21700 cells and take it for a test flight on the Foxeer Aura 7 quadcopter where it delivers 20 minute flight times. Links (not sponsored or affiliate): Where I got the batteries : https://18650batteries.nz/ The Foxeer Aura 7 BNF long-range quadcopter: https://www.foxeer.com/foxeer-aura-7-rtf-lr-drone-analog-o3-vista-hdzero-g-465 A huge thanks to those who support me on Patreon and thus free everyone from the tyranny of sponsorship segments, mid-roll ads and affiliate links. https://www.patreon.com/rcmodelreviews