Run your Nitecore headlamp longer, top up your phone, and stay seen on the way home.
A 6,000mAh carbon-fibre battery that clips to the headband, feeds your headlamp through USB-C and carries a red rear safety light.
- 6,000mAh (21.6Wh) on a 21700 cell, up to 2x longer headlamp runtime
- USB-C output at 5V/2A (10W) to charge your phone or other devices
- Rear red safety light so traffic and trail-mates see you in the dark
- Carbon-fibre reinforced shell, 88g on its own
- IP68 dust and water sealed for rain, mud and wet crossings
- Widened headband mount keeps the weight balanced front to back
- Works with NU40, NU43, NU45, NU50, NU53, HC60 UHE, HC65 UHE and HC70 UHE
Hours more light, fed straight to your headlamp.
Plug the Carbon Battery 6K into a compatible headlamp with the USB-C cable and the lamp draws from the 6,000mAh pack first, holding its own internal battery in reserve. You get a full night of light from a single setup, with up to 2x the usual runtime on an NU40.
Run a headlamp straight through a long event or an overnight shift, then still have its built-in cell ready when the pack runs flat. One charge covers sunset to sunrise on most trail runs.
One USB-C port that also tops up your phone.
The same USB-C port that feeds your headlamp puts out 5V/2A, so the 6,000mAh pack doubles as a pocket power bank. Pull it off the headband at the car park, plug in your phone and get a meaningful top-up before the drive home.
It charges phones, cameras and other USB-C devices the same way, so one small pack covers your light and your screen on a weekend out.
A red rear light that keeps you seen.
A red safety light sits on the back of the pack, facing behind you as you walk or run. Hold the power button for one second to switch it on, and drivers, cyclists and the runners behind you pick you out well before they reach you.
It is the visibility a road-side walk home or a night trail wants, built into the battery you are already wearing.
Carbon fibre keeps 6,000mAh down to 88 grams.
The carbon-fibre reinforced shell packs a 6,000mAh cell into a body that weighs just 88g, about the weight of a small chocolate bar. That is an energy density of 245.5Wh/kg, so you carry hours of extra light while keeping your head and pack light.
The same shell stands up to knocks, grit and a dropped pack, so a rugged battery does not have to be a heavy one.
A headband built for long miles.
The kit comes with a 32mm widened headband that spreads the load across your head, with a reflective strip and a hollow weave that lets sweat through on a warm climb. The bracket holds the battery steady so it stays put on a downhill run.
A braided USB-C charging cable is included too, made from a stretchy, skin-friendly fabric that sits flat against the strap.
A steadier beam, not just a longer one.
When the pack is connected, compatible headlamps switch into Performance Mode, which eases the rate at which brightness steps down so output stays more stable over time. The trail ahead holds a consistent level of light instead of fading as the hours add up.
For a night run or a long approach, that means fewer dim patches and a beam you can trust deep into the dark.
WHY THE CARBON BATTERY 6K OVER A SPARE POWER BANK
Powers the headlamp directly
It feeds your Nitecore headlamp through USB-C while you wear it, for up to 2x the runtime. A pocket power bank only charges between uses.
Rides on your head, hands free
The included bracket and widened headband carry it balanced front to back, so nothing swings in a pocket or tugs on a cable.
Seen as well as lit
A built-in red rear light keeps you visible from behind. An ordinary battery does nothing for your safety on the road.
Light and weatherproof
88g of carbon fibre, sealed to IP68 for rain and wet crossings, where a typical bank wants to stay dry in a bag.
Balanced weight that settles in.
Mounted at the back of the headband, the pack counterbalances the headlamp at the front, so the whole setup sits level and steady. It holds its place through a downhill and stays put as you pick up the pace.
It settles into a stable, comfortable fit you can wear for hours on a run, a hike or around camp.
WHERE IT EARNS ITS PLACE
Trail Running
A steadier beam deep into a night run, balanced weight that does not bounce, and a red rear light on the road sections.
Hiking
Up to 2x the headlamp runtime for a long descent, plus a phone top-up for GPS when the screen runs low.
Camping
Hours of light around camp from one charge, IP68 sealing for dew and rain, and USB-C to keep devices going.
Night Walks & Commutes
The red rear light keeps you seen by traffic, while the headlamp lights the path on the way home.
EXTENDED RUNTIME BY HEADLAMP
| PAIRED WITH | RUNTIME UP TO |
| NU40 | 2x longer |
| NU43 | 1.6x longer |
| NU50 | 1.3x longer |
| HC65 UHE | 1.2x longer |
Compatible headlamp models
NU40, NU43, NU45, NU50, NU53, HC60 UHE, HC65 UHE and HC70 UHE.Connect with the included USB-C cable.
TECHNICAL SPECIFICATIONS
| Cell | 21700 Li-ion |
| Capacity | 6,000mAh 3.6V (21.6Wh) |
| Rated Energy | 3,700mAh 5V (TYP 1A) |
| Energy Density | 245.5Wh/kg |
| USB-C Input | 5V⎓2A |
| USB-C Output | 5V⎓2A (10W) |
| Rear Light | Red safety blinker |
| Water Resistance | IP68 (down to 2m) |
| Dimensions | 22.8mm × 90.0mm (0.90" × 3.54") |
| Weight | 88g (3.10 oz) battery; 134g (4.73 oz) with accessories |
FREQUENTLY ASKED QUESTIONS
Which headlamps does it fit?
It powers the Nitecore NU40, NU43, NU45, NU50, NU53, HC60 UHE, HC65 UHE and HC70 UHE through their USB-C ports, using the included cable. The battery and headband form the kit, and your headlamp clips into the same band. The headlamp itself is not included.
Can it charge my phone while it is on the headband?
Yes. The USB-C port outputs 5V/2A whether the pack is on the band or in your hand, so you can run a cable to your phone or simply pull the battery off the bracket and use it as a 6,000mAh power bank at a rest stop.
Is the red rear light always on?
No, you switch it on when you want it by holding the power button for one second, and a short press instead shows the remaining charge across three red indicators at 100, 70 and 30 percent. So the rear light is there for road and low-light visibility, and stays off to preserve charge whenever you leave it that way.
What's In The Box
- 1x Carbon Battery 6K (6,000mAh) - carbon-fibre external battery with red rear safety light
- 1x Headband - 32mm widened reflective band
- 1x Bracket - holds the battery on the headband
- 1x USB-C to USB-C Charging Cable - braided fabric cable
Longer runtime, a phone top-up and a rear light, all on one headband.
GET YOUR CARBON BATTERY 6K NOWYou’re Backed by Our 60-Day Ironclad Guarantee
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Try it for 60 days. If it’s not right for you, send it back.
We stand behind our gear. If you’re not happy with your purchase, just return the full package within 60 days and we’ll issue a full refund—no fuss, no forms, no hoops to jump through.
What Happens After You Order
- You’ll get an instant order confirmation email with your receipt.
- We’ll pack your order the next working day and send you a tracking number once it’s on the way.
- From the moment you order to the moment it reaches your hands, we’re here to keep you updated and supported.
When will I receive my gear?
- Singapore: Delivered to your doorstep in 4–6 working days.
- International: Arrive within 10–14 working days.
Returns and warranty
- Every product comes with a 1 to 3-year replacement warranty (depending on the item).
- If anything isn’t working right, just let us know. We’ll make it right.
FREE Gift with Purchase: Limited Edition Ember Shard Whistle
Spend $99 or more today, and we'll automatically include a limited-edition Glow-in-the-Dark Ember Shard Whistle when packing your order.
Charge it quickly under sunlight or your flashlight, and enjoy its subtle glow throughout the night—perfect for marking gear, emergency kits, or attaching to your bag.
Limited quantities. These will be swapped (at our discretion) to other gift items if shards are unavailable.
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