Nitecore NB20000 Gen 3 Power Bank

The Nitecore NB20000 Gen 3 doubles the capacity of the NB10000 to 20,000mAh in a carbon-fibre body that Nitecore builds to keep the weight down relative to that capacity. Both charging and output run through USB-C, with pass-through charging so the bank and a connected device can charge together from one outlet. An IPX5 rating means it handles splashes and light rain but isn't built for submersion, so it's fine clipped to the outside of a pack in a shower but shouldn't go for a swim. With 20,000mAh on tap, it suits longer trips or charging multiple devices between resupply points, where a 10,000mAh bank would run out too soon.