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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Sofirn HS40 Rechargeable Headlamp 2000 Lumens, Headlamp Flashlight with SST40 LED 6500k, Magnetic Tail Cap, for EDC Running Camping Hiking (HS40-6500k)

Sofirn HS40 Rechargeable Headlamp 2000 Lumens, Headlamp Flashlight with SST40 LED 6500k, Magnetic Tail Cap, for EDC Running Camping Hiking (HS40-6500k)

Product ID: 530143720

Details

Special Feature
Adjustable
Colour
Black
Power Source
Battery
Light Source Type
LED
Material
Aluminium

💡2000 lumens max brightness

🔋USB-C rechargeable in 3 hrs

⚖️Ultra-light 65g headlamp

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€ 257.75

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Light Up Your Next Adventure — Don’t Get Left in the Dark!

BUILT TO BRAVE THE ELEMENTS - Waterproof aluminum body and included spare O-rings mean this headlamp is ready for rain, mud, and rugged outdoor use.
POWER UP FAST STAY OUT LONGER - Recharge quickly via USB-C in just 3 hours and enjoy up to 8 hours of medium brightness runtime—no more dead batteries on the trail.
BLINDING BRIGHTNESS TAILORED TO YOU - SST40 LED delivers up to 2000 lumens with smooth stepless dimming from 1 to max for any adventure lighting need.
FEATHERWEIGHT COMFORT FOR ALL DAY WEAR - At only 65g without battery, the adjustable headband ensures you forget you’re even wearing it during long hikes or runs.
VERSATILE 2 IN 1 DESIGN FOR EVERY SCENARIO - Detachable right-angle flashlight with two-way clip lets you switch from hands-free headlamp to pocket flashlight in seconds.

The Sofirn HS40 is a cutting-edge rechargeable headlamp featuring a powerful SST40 LED that outputs up to 2000 lumens with adjustable brightness. Lightweight at just 65g, it offers versatile use as both a headlamp and detachable right-angle flashlight. Equipped with a USB-C rechargeable lithium-ion battery, it charges fully in 3 hours and runs up to 8 hours on medium mode. Designed for outdoor enthusiasts, its waterproof aluminum build and practical accessories make it the ultimate companion for camping, hiking, running, and everyday carry.

Specifications

ASIN	B09SYR293L
Are Batteries Included	Yes
Battery Description	Lithium-Ion
Battery Type	Lithium Ion
Brand	sofirn
Colour	Black
Customer Reviews	4.4 out of 5 stars 322 Reviews
Enclosure Material	Aluminium
Finish Types	Anodized
Included Components	Battery
Item Dimensions D x W x H	120D x 25W x 25H Millimeters
Item Type Name	1
Item Weight	65 Grams
Light Path Distance	200 Metres
Light Source Type	LED
Manufacturer	sofirn
Material	Aluminium
Model number	A-001
Mounting Type	Head Mount
Number of Batteries	1 Lithium Ion batteries required. (included)
Number of Lights	1
Power Source	Battery Powered
Product Features	Adjustable,Lightweight
Recommended Uses For Product	Camping, Hiking, Everyday use, Handheld use
Runtime	2 hours
Special Feature	Adjustable , Lightweight
Specification Met	UL
Style	Modern
Unit Count	1.0 Count
Voltage	3.7 Volts (DC)
Water Resistance Level	Waterproof
White Brightness	2000 Lumens

Reviews

S**Y

Great EDC & multipurpose flashlight

18.10.2023

K**N

Great

10.09.2025

M**N

Great light

29.11.2024

J**N

Great for EDC

3.09.2022

S**Y

Star light star bright!

30.10.2023

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