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, hands-free and hassle-free!

FAST USB C RECHARGE - Get back to exploring quickly with a 3-hour USB-C recharge, delivering up to 8 hours of medium brightness light—stay powered all night.
FEATHERLIGHT COMFORT - Weighing only 65g, this headlamp feels like a second skin, letting you focus on the journey, not the gear.
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.
BUILT FOR THE ELEMENTS - IPX8 waterproof rating and durable aluminum body mean this headlamp thrives in rain, mud, and rugged terrain—your ultimate outdoor companion.
VERSATILE 2 IN 1 DESIGN - Switch effortlessly between a hands-free headlamp and a detachable right-angle flashlight—perfect for work, repairs, or late-night hikes.

The Sofirn HS40 is a cutting-edge rechargeable headlamp featuring a super bright 2000-lumen SST40 LED with a 175m beam distance. It offers versatile stepped and ramping brightness modes from 1 to 2000 lumens, USB-C fast charging in 3 hours, and up to 8 hours of medium-level illumination. Weighing just 65g, it combines lightweight comfort with rugged IPX8 waterproof durability and a detachable right-angle flashlight design, making it ideal for camping, hiking, and everyday carry.

Specifications

Brand	Sofirn
Manufacturer	Sofirn
Product Dimensions	12 x 2.5 x 2.5 cm; 65 g
Batteries	1 Lithium Ion batteries required. (included)
Item model number	A-001
Part Number	HS40-6500K
Number of Items	1
Style	Modern
Colour	Hs40-6500k
Material	Aluminum
Finish types	Polished
Number of Lights	1
Included Components	Battery
Voltage	3.7 Volts (DC)
Special features	Adjustable,Lightweight
Power and Plug Description:	Battery Powered
Switch Installation Type	Head Mount
Batteries included?	Yes
Batteries Required?	Yes
Certification	UL
Type of Bulb	LED
Luminous Flux	2000 Lumen
Wattage	10 Watt-hours
Item Weight	65 g
Guaranteed software updates until	unknown

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