Nitecore NB10000 Gen 3
10,000 mAh (~37 Wh), carbon fibre, ~150 g
2.9 on Amazon
The best capacity-per-gram you can buy and it clears every airline limit without a conversation — 10,000 mAh is about two phone charges, so on a fortnight above the solar line you will still be paying a lodge occasionally.
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Do not buy this if: A camera-heavy trip or a group sharing one bank. Take the 20,000 mAh instead.
Not every route needs it. These are the ones where our guides would put it on your list.
Everything else we recommend in power banks, including the ones we think suit a different trekker.
Best capacityAnker Power Bank 20,000 mAh
Four to five phone charges, which is genuinely a whole Everest Base Camp trek without ever paying a lodge — you carry 350 g up to 5,545 m to save perhaps twenty dollars.
