will this accept 21700 Batteries?

I don't believe so, mine came with a 18650 3000 mAh battery.

How long is the runtime for Sofrin HS40?

Started at 1pm on the highest power it didn't stay on high long 3 hours it switches down itself. 8:20pm The big flashlight is very dim The small flashlight is on it's low not the lowest moonlight. But clearly, the small flashlight is winning. The large flashlight looks about dead. The small one has been brighter the whole time.

Are you able to use this as a power bank?

Not, But you can use SP36, LT1, Q8 Pro

What kind of battery does the hs40 take? 18650? 16340?

18650 battery is correct. I've been very happy with Sofirn batteries. Sofirn is a great company. I've bought 35-40 of thier lights over the past 3 years

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Description

🌟 Light up your world, stay ahead of the pack!

FEATHERLIGHT COMFORT - At just 115g with battery, the adjustable headband offers all-day comfort for hands-free exploration without the bulk.
UNMATCHED BRIGHTNESS - Illuminate your path with a powerful 2000-lumen SST40 LED, reaching up to 175 meters—never miss a detail on your next adventure.
DUAL MODE VERSATILITY - Switch effortlessly between a headlamp and a detachable right-angle flashlight—perfect for EDC, camping, or emergency fixes.
SEAMLESS USB C RECHARGE - Quick 3-hour recharge with USB-C ensures your headlamp is always ready to go—ditch disposable batteries and stay eco-smart.
PRECISION LIGHTING CONTROL - From a subtle 1-lumen moonlight mode for map reading to stepless ramping for custom brightness, tailor your light to every moment.

The Sofirn HS40 Rechargeable Headlamp delivers an impressive 2000 lumens via a high-efficiency SST40 LED, with a beam distance of 175 meters. Featuring USB-C fast charging, a lightweight aluminum build at just 115g with battery, and versatile use as both a headlamp and detachable flashlight, it’s engineered for professionals and outdoor enthusiasts who demand reliable, customizable lighting on the go.

Specifications

Special Feature	Adjustable,Lightweight
Colour	Black
Power Source	Battery Powered
Light Source Type	LED
Material	Aluminum
White Brightness	2000 Lumens
Included Components	Battery
Product Dimensions	120D x 25W x 25H Millimeters
Voltage	3.7 Volts (DC)
Battery Cell Composition	Lithium Ion
Item Weight	65 Grams
Number of Batteries	1 Lithium Ion batteries required. (included)
Water Resistance Level	Waterproof
Brand	sofirn
Brightness	2000 Lumen
Battery Description	Lithium-Ion
Style	Modern
Specification Met	UL
Mounting Type	Head Mount
Recommended Uses For Product	Camping, Hiking, Everyday use, Handheld use
Manufacturer	sofirn
Size	HS40- Kit
Part Number	HS40-6500K
Number of Items	1
Number of Lights	1
Special Features	Adjustable,Lightweight
Batteries Included	Yes
Batteries Required	Yes
Wattage	10 Watt Hours

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