Nitecore NB20000 Gen 3
(151 reviews)
20,000 mAh for just 291 g: the carbon-fiber Nitecore NB20000 Gen 3 is the ultralight power bank for hikers and travellers.
Characteristics
- Capacity: 20,000 mAh (72 Wh)
- Output: 2x USB-C, 22.5 W max
- Weight: 291 g (carbon fiber)
- Toughness: IPX5, pass-through
- Ultralight 20,000 mAh, cabin-friendly
Detailed overview: Nitecore NB20000 Gen 3 carbon-fiber power bank
The Nitecore NB20000 Gen 3 is a 20,000 mAh power bank designed for the outdoors and light travel. Its signature is a woven carbon-fiber body that makes it both very tough and exceptionally light: 291 g for 20,000 mAh, a capacity-to-weight ratio few banks reach. The IPX5 rating protects it from water spray and rain, a real asset on the trail.
It bets on USB-C: two ports each delivering up to 22.5 W, enough to recharge a smartphone at a good pace. You can plug in two devices at once, for example a phone and a smartwatch, or recharge the bank while powering a device thanks to pass-through. LED indicators show the remaining level at a press of the button.
With 20,000 mAh, or about 72 Wh, it recharges a modern smartphone three to four times, enough for several days off-grid or one long multi-device day. It refills itself over USB-C at up to 18 W, in a little under five hours with a good charger. Its 72 Wh keep it under the 100 Wh cabin limit set by most airlines, a real asset for travel.
Two limits to know: its 22.5 W output is meant for smartphones, tablets and small devices, not to charge a laptop at full speed, and it has no USB-A port, everything goes through USB-C. For anyone after a large capacity in a minimal size and weight, water-resistant and cabin-friendly, the NB20000 Gen 3 is one of the best power banks around.
Full specifications
Detailed characteristics
Battery
| Rated capacity?Cell capacity in milliamp-hours, as stated by the manufacturer. | 20000 mAh |
|---|---|
| Actual energy?Actual stored energy in watt-hours; what matters for runtime and air travel (100 Wh cabin limit). | 72 Wh |
| Battery chemistry?Cell type; LFP lasts longer, Li-ion/LiPo is lighter. | Li-ion |
Output (device charging)
| Max output power?Maximum total power delivered; above 60 W it can charge a laptop. | 22.5 W |
|---|---|
| USB-C ports?Number of USB-C ports and the fastest port's power. | 2 × 22.5 W |
| Fast-charge protocols?Supported fast-charge standards (PD, QC, PPS…); PD/PPS is the most universal. | USB PD, QC |
| Wireless charging (Qi)?Inductive charging of a phone placed on top, and its power. | No |
| Magnetic attachment (MagSafe)?Attaches magnetically to the back of a MagSafe-compatible iPhone. | No |
Recharging the power bank
| Recharge power (input)?Maximum input power to recharge the power bank; higher means faster. | 18 W |
|---|---|
| Recharge time 0-100%?Time to fully recharge the power bank. | 300 min |
| Pass-through charging?Can charge a device while being recharged itself (pass-through). | Yes |
Cable and interface
| Built-in cable?A cable is permanently attached to the power bank (nothing extra to carry). | No |
|---|---|
| Retractable cable?The built-in cable retracts into the housing. | No |
| Cable included?A cable is included in the box. | Yes |
| Display?Level display: simple LED indicators or a digital screen (%, watts). | None |
| LED light?Built-in LED torch / light. | No |
Form factor
| Weight?Weight of the power bank, in grams. | 291 g |
|---|---|
| Dimensions (L × W × D)?Length × width × depth, in millimetres. | 111 × 55 × 25 mm |
Warranty
| Warranty?Length of the manufacturer's warranty. | 1 year |
|---|
⚡ How many charges with this power bank?
With 72 Wh of capacity, the Nitecore NB20000 Gen 3 power bank recharges iPhone 16 ~3.8 times or Samsung Galaxy S25 ~3.4 times.
| Smartphone | Charges |
|---|---|
| iPhone 13 | ~4.1 |
| iPhone 15 | ~4 |
| Samsung Galaxy S25 Ultra | ~2.7 |
| iPhone 18 Pro Max | ~2.4 |
| Tablet / console | Charges |
|---|---|
| iPad mini (A17 Pro) | ~2.7 |
| iPad (A16) | ~1.8 |
| iPad Pro | ~1.7 |
| Xiaomi Pad 7 | ~1.5 |
Rough estimate: real-world losses (conversion, cable, heat) are around 25 to 35%.
User manual / Instructions for use (PDF)
Comparison
At around 90, the Nitecore NB20000 Gen 3 targets ultralight 20,000 mAh power banks for the outdoors, through searches like "best lightweight power bank for hiking" or "Nitecore NB20000 vs Anker". Here is how it stacks up against three alternatives: the Nitecore NB10000 Gen 3, the Anker 335 (PowerCore 20K) and the INIU 20000 100W.
| Criterion | NB20000 Gen 3 | Nitecore NB10000 Gen 3 | Anker 335 (PowerCore 20K) | INIU 20000 100W |
|---|---|---|---|---|
| Capacity | 20,000 mAh | 10,000 mAh | 20,000 mAh | 20,000 mAh |
| Max power | 22.5 W | 30 W | 20 W | 100 W |
| Weight | 291 g | 150 g | ≈ 350 g | ≈ 440 g |
| Body | Carbon fiber, IPX5 | Carbon fiber, IPX5 | Plastic | Plastic |
| Observed price | ≈ 90 | ≈ 55 | ≈ 45 | ≈ 45 |
In short, the NB20000 Gen 3 plays the capacity-to-weight card to the full: 20,000 mAh for 291 g is clearly lighter than conventional banks of the same capacity, with a tough, spray-resistant carbon-fiber body. The NB10000 is even lighter but half the capacity, the Anker and INIU are cheaper but heavier, and the INIU pushes power to 100 W for laptops. For hiking, trekking and light travel, where every gram counts, the NB20000 Gen 3 is hard to beat.
Related video
Video: NITECORE NB20000 Review (2 Weeks of Use)
Our tester's review: Guillaume Hoarau
The NB20000 Gen 3 is the bank we grab without hesitation for hiking or travel, when every gram counts. Its killer argument is the capacity-to-weight ratio: 20,000 mAh for just 291 g, where a conventional bank of the same capacity often weighs 350 to 450 g. The woven carbon-fiber body is gorgeous, light and reassuring, and the IPX5 rating means no panic in a shower. The two USB-C ports are handy for charging a phone and a watch at once, and pass-through lets you recharge the bank while powering a device. Its 72 Wh keep it under the airline limit, a real plus for travel. Two honest reservations: the 22.5 W output is enough for smartphones, tablets and small devices, but not to charge a laptop at full speed, and the lack of a USB-A port means everything goes through USB-C. For the outdoors and light travel, it remains a benchmark that is hard to beat.
Frequently asked questions: Nitecore NB20000 Gen 3 carbon-fiber power bank
With its 20,000 mAh (about 72 Wh), it recharges a modern smartphone three to four times depending on its battery size. Enough for several days away from an outlet, or one long multi-device day.
Thanks to its woven carbon-fiber body, which offers great toughness for minimal weight: 291 g for 20,000 mAh, against 350 to 450 g for a conventional bank of the same capacity.
It can top up an ultrabook in a pinch, but its 22.5 W output is meant for smartphones and tablets, not to charge a laptop at full speed. For a laptop, aim for a 65 W or higher bank.
Yes. At 72 Wh, it stays under the 100 Wh cabin limit set by most airlines, with no special approval. It travels in your carry-on, never in checked baggage.
Yes. Its two USB-C ports let you charge two devices simultaneously, and pass-through even lets you recharge the bank while powering a device.
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Published on 19/07/2026