At a Glance#
Product : Nitecore NB10000 Gen2
Brand : Nitecore
Best For : Ultralight hikers, EDC enthusiasts, and frequent travelers who refuse to carry unnecessary weight
Form Factor : Carbon fiber slab, 121.9mm x 59mm x 10.6mm
Buy Now : View on Amazon
Key Highlights:
- Weighs just 150g — lighter than an iPhone 15 Pro
- Carbon fiber shell keeps the weight down without a metal enclosure
- 20W USB-C output (5V/3A, 9V/2.22A, 12V/1.68A) charges phones at full speed
- IPX5 water-resistance rating handles rain and trail splashes
- At 10.6mm it is slim for a 10,000mAh bank and slides into a pocket a thicker brick would not
Who Should Buy This#
The NB10000 Gen2 hits the sweet spot for anyone who needs reliable portable power but hates bulky accessories. It delivers 10,000mAh capacity in a package Nitecore markets as the world's most compact and lightest 10,000mAh mobile power, and it disappears into a jacket pocket.
Perfect for:
- Ultralight backpackers who count every gram and need a power bank that won't drag down their pack weight
- EDC minimalists who want pocket-friendly backup power without the brick-in-pocket feeling
- Business travelers who need a slim charger that fits in a suit jacket or laptop bag without adding bulk
- Trail runners and cyclists who need water-resistant power that survives sweat and rain
Design & Build Quality#
The NB10000 Gen2 is built around one priority, and it is not capacity. The Amazon listing describes a carbon fiber polymer frame with carbon fiber sheets; nitecore.com's own spec sheet says only Li-ion cell and carbon fiber shell. Either way the whole thing weighs 150 g. Pick it up and you will double-check that there is actually a battery inside.
At 10.6 mm thin, it stacks neatly with a phone or slides into pockets that would reject thicker power banks. The two ports and a row of four charge-level LEDs sit together on one short end, next to a small power button, so a quick press tells you where you stand before you leave the house.
Key Features#
20W USB-C Output and What Actually Reaches Your Phone#
The USB-C port is rated 5V/3A, 9V/2.22A, 12V/1.68A for a 20W maximum, which is phone fast-charging territory rather than a trickle. Input runs at up to 18W through the same USB-C port (5V/2.4A or 9V/2A). Worth knowing before you plan around capacity: the cell is 10,000mAh at 3.85V, or 38.5Wh, but Nitecore's rated energy — the part that actually reaches your phone at 5V — is 6,400mAh.
What the Carbon Fiber Actually Buys You#
The listing's description is a carbon fiber polymer frame with carbon fiber sheets, which is a composite rather than a plain moulding. The practical result is a shell that takes the daily abuse of pocket carry without adding the weight a metal enclosure demands.
IPX5 Water Resistance#
An IPX5 rating means the NB10000 Gen2 is tested against low-pressure water jets from any direction. In practical terms that covers rain, trail splashes and a sweaty pack, but it is not a submersion rating — do not drop it in a stream. Nitecore now sells other water-rated banks too, including the NB Air and NB Plus, so this is no longer the outlier it once was in the range.
Dual Output for Two Devices#
The USB-C port (20W) and USB-A port (18W) can charge two devices simultaneously. Combined output maxes at 15W when both ports are active, which is enough for topping off a phone and earbuds at the same time but not for pushing both hard.
One thing to know before you commit: this is no longer Nitecore's current generation. Nitecore's own NB10000 page now recommends an NB10000 Gen4 at 22.5W alongside a 30W CARBO 10000 Gen2, so the Gen2 is the older, slower, cheaper end of its own family.
Technical Specifications#
Capacity : 10,000mAh / 38.5Wh (3.85V)
Weight : 150g (5.29 oz)
Dimensions : 121.9mm x 59mm x 10.6mm (4.8" x 2.32" x 0.42")
USB-C Output : 5V/3A, 9V/2.22A, 12V/1.68A (20W max)
USB-A Output : 5V/3A, 9V/2A, 12V/1.5A (18W max)
USB-C Input : 5V/2.4A, 9V/2A (18W max)
Combined Output : 5V/3A (15W max when both ports active)
Water Resistance : IPX5 (low-pressure water jets, not submersion)
Shell Material : Carbon fiber composite
Cell Type : Lithium-ion
Rated Energy : 6,400mAh at 5V (TYP 1A)
In the Box : Nitecore states a USB-A to USB-C charging cable; the Amazon listing package is the power bank plus a Nitecore keychain tag
Pros & Cons#
Pros:
- Incredibly light at 150g — lighter than most smartphones
- Carbon fiber shell keeps the weight down without a metal enclosure
- At 10.6mm it is slim for a 10,000mAh bank and pockets easily
- 20W USB-C output matches most phone fast-charge speeds
- IPX5 water resistance handles rain and trail splashes
- Dual output charges phone and earbuds simultaneously
Cons:
- 20W max output is too low for laptop charging
- No wireless charging capability
- Costs more than a plain plastic 10,000mAh bank
- Combined output drops to 15W when using both ports
- Rated energy is 6,400mAh at 5V, well under the 10,000mAh cell figure on the label
Final Verdict#
Buy it. The Nitecore NB10000 Gen2 is the power bank for people who hate carrying power banks — at 150 g it is lighter than the phone it is charging, it fits anywhere, and 20W is enough to keep that phone alive through a full day of heavy use.
Our recommendation: If you carry a phone, you should carry this. At 150g, the weight penalty is negligible and the peace of mind is worth every gram. Grab one for your EDC kit: View on Amazon