I used an A123 battery in an old glider when the A123 was new. It was much better than the old NiCd, kind of bulky. It was still heavier than LiPo, but worked quite well on the Amptique. Hey, I still have that, I bet the batteries are still good after maybe 8 to10 years too. None of my LiPo's are. I bought the A123 copies after a LiPo burned on me.