But it is not a flashlight first by design! Its main purpose in life is to be a portable battery pack. I just picked up one of these and the LED flashlight built into it is actually pretty bright (probably 10-20 lumens) and good enough to light your way around a dark house. The specifications do not say how much current the light drains, but the relatively low output combined with a 15000 mAh battery pack might just make this thing run forever! Could any of you out there take a guess on how much current the LED could be drawing from something like this? Here is a link to it so you can get a better idea of what I am talking about. http://www.ianker.com/product/79AN15K-WA