Anker Power Bank 20,000 mAh
20,000 mAh (~74 Wh), ~350 g
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.
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Do not buy this if: Short treks, or anyone whose porter weight allowance is already tight.
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 overallNitecore NB10000 Gen 3
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.
