Nitecore NB10000 Gen 4 power bank review: the ultralight benchmark, now waterproof
A phone running GPS with a bright screen is doing the most power-hungry work it can do, and the backcountry has no outlets. The Nitecore NB10000 has been the power bank serious backpackers reach for because it carries a full 10,000 mAh at little more than the weight of an ordinary 5,000 mAh bank. The Gen 4 keeps that weight, and adds sealing against immersion, faster recharging, an eco mode for small devices and a charging cable that doubles as a lanyard.
Quick take
The ultralight power bank to buy now: a genuine 10,000 mAh at about 5.2 oz (147 g), two USB-C ports, IPX7 sealing against immersion and a lanyard charging cable in the box. It delivers about two full charges of a typical phone and recharges in about three hours. It loses noticeable efficiency in the cold, its lights stay on while it charges, and it costs much more than an ordinary bank. If grams matter on your trips, this is the one.
What it does
The NB10000 Gen 4 stores 10,000 mAh (about 39 Wh) in a flat carbon-fibre body roughly 4.6 x 1.8 x 0.6 in (11.6 x 4.7 x 1.5 cm). Independent testing measured about 34.8 Wh delivered at a steady 5 W, which works out to about two full charges of a typical phone, more for a small phone and less for the largest. Either USB-C port delivers up to 22.5 W on its own, enough to fast-charge a phone; with two devices connected, the total drops to 15 W. One port also refills the bank, which takes about three hours from empty at up to 22.5 W, faster than the Gen 3. An eco mode limits output to about 5 W for watches, headlamps and earbuds and gets a little more energy out of each charge. The case is rated IPX7, meaning it survives immersion to 3.3 ft (1 m) for 30 minutes, a real step up from the Gen 3’s splash rating. A short USB-C cable on a lanyard comes in the box and clips through the case, so you always have one with the bank. Tap the case near the logo and a four-light gauge shows the charge remaining. Nitecore claims 5 oz (143 g); independent scales read about 5.2 oz (147 g).
What verified buyers say
The Gen 4 is new, and owner reviews are still few. Across the verified-purchase reviews so far, the same points come up:
- Small and light in the hand. Owners find it smaller than it looks in photos and like the premium feel of the carbon-fibre case.
- The upgrades are noticed. Owners moving from earlier NB10000s like the new features.
- The weight claim is slightly optimistic. One owner weighed it at about 5.2 oz (147 g), or 5.4 oz (153 g) with the cable, against the claimed 5 oz (143 g), and was disappointed that it was not quite the lightest bank on the market.
Worth knowing
Cold is its main weakness: in testing, efficiency dropped by about 13 percent when the bank was chilled, more than most rivals, so in winter keep it in an inside pocket by day and in your sleeping bag at night. The four-light gauge and the lights around the ports stay on while it charges and are bright enough to notice in a dark tent; a strip of tape over them solves it. Tap-to-wake works only some of the time, so press the button instead. Both ports are USB-C, so older USB-A cables need an adapter. The hard plastic corners are less forgiving of drops than the Gen 3’s rubber bumpers, it has no dust rating, and charging a phone while the bank itself is recharging is slow. Plan on about two phone charges, not the four or five the capacity number seems to promise.
Who it is for
This is the bank for backpackers, thru-hikers and anyone running a phone, a satellite messenger and a headlamp over several days between resupplies, where every ounce counts. If you mostly day hike or car camp, an ordinary 10,000 mAh bank does the same job for much less money; our pick there is the INIU P41. If you need multi-day capacity or a laptop charge, our Enthusiast pick, the INIU Cougar P62, carries 20,000 mAh and a 65 W port. Its eco mode is the right way to top up a rechargeable headlamp or a satellite messenger such as the inReach Mini 3 Plus, and it pairs with the phone setup in our guide to using your phone as a backcountry GPS, which works best with a paper map and compass as backup. The Gen 4 replaces the NB10000 Gen 3, which Nitecore has discontinued; if you own one or find one, that review still applies, and its capacity is almost the same.
Specs at a glance
- Capacity10,000 mAh (about 39 Wh)
- Deliveredabout 34.8 Wh at 5 W in testing
- Listed weight5.2 oz (147 g) · bank without cable
- Sizeabout 4.6 x 1.8 x 0.6 in (11.6 x 4.7 x 1.5 cm)
- Ports2x USB-C
- Output22.5 W single, 15 W shared
- Rechargeup to 22.5 W, about 3 hours
- Extraseco mode, pass-through, lanyard USB-C cable
- Water resistanceIPX7
- Best forbackpacking, thru-hiking
Wilderness Experts is reader-supported. As an Amazon Associate we earn from qualifying purchases; when you buy through links on our site we may earn a commission at no extra cost to you. It never changes what we recommend.
The Verdict
The Nitecore NB10000 Gen 4 does what the Gen 3 did, a genuinely useful 10,000 mAh in about 5.2 oz (147 g), and fixes its weakest points: it now survives immersion, recharges faster and comes with its own cable. Its trade-offs are cold-weather efficiency, lights that stay on while charging and a premium price. If weight matters on your trips, this is the power bank to build your charging kit around. Build the rest of the system with our guide to building a survival kit you will actually carry.
