Not being a fan of the multiple AAA approach to power, I went in search of the option … Found that the 18650 battery is a tough find … Certainly not at my local hardware store and it appears as a rechargeable on Amazon. And based on what I’m seeing on-line, it seems small, smaller even when the included sleeve is used.
Other than that, this works well as a back-up, pocket-sized flash. Good for glove box or night stand. The zoom is interesting, going from circle to near box-shaped.