Nitecore NB10000 GEN4

The Nitecore NB10000 GEN4 packs 10,000mAh into just 143g, making it one of the lightest power banks in its capacity class. Silicon-carbon cells are what enable that weight — they hold more energy per gram than conventional lithium-ion cells at equivalent capacity. A single USB-C port handles both charging and discharging at up to 22.5W and supports pass-through charging, so you can top up the bank overnight at camp while simultaneously charging a phone from it. An IP67 rating adds dust protection and short-term submersion resistance, a step up from the IPX4–5 ratings common in this category. The capacity-to-weight ratio makes the NB10000 GEN4 a rational pick for multi-day treks, where every phone charge has a real cost in grams carried — well suited to thru-hiking and lighter alpine trips with limited access to power.