>>1620171Not really. Alkaline capacity blows, especially if you’re running the flashlight on high. So in a decently bright flashlight, 3xAAA batteries are going to give you like 500mAh capacity. 4.5Vx500mAh is going to be 2.25Wh. Compare that to a high capacity 18650, 3500mAh @ 3.7V, nearly 13Wh.