11% charge drop overnight (how long is that, 6h, 8h, 10h ?) is not too bad I think. I'd imagine you get that with almost any device and AF does not have anything like an exceptionally good battery. Heck, I consider it extremely crazily excellent performance that my SFOS/Hammerhead on Fiskarsinjoki drops about 40% in 24h when idle... that's around 13% "overnight"