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Yeah it sounds like a fucking sale ad, so what. Anyway, a guy that fly's with us as well as makes some of the best antennas for drones as well as other things has started a new YouTube channel. He is also a big bike guy, loves to get old pieces of shit and rebuild them. Being an electrical engineer he is always coming up with new ideas, so on his new channel he just made a new battery for one of his bikes using 18650 batteries and it kicks ass! If you have some DIY soldering skills it may be worth a go. 2 vids for some options.