How to keep a phone alive on a Nepal trek, and the battery rule that catches people

Trek Guide Teahouse sockets cost money and cold kills batteries faster than use does. Sizing a power bank in watt-hours, and why it cannot go in your checked… By Rajan Gurung · Jun 13, 2026 Read the full story

Electricity on a Nepal trek is a paid service, not a fixture. Teahouses charge per device and the price climbs with altitude, because the power comes from a small hydro line or a solar panel that someone carried up. Bring one power bank of about 20,000 mAh… Travel Himalaya Nepal · News Read the full story

Sizing a power bank in watt-hours, not milliamp-hours

Airlines rate batteries by energy, and the number on the case is not that number. Watt-hours are what the rules use, and you convert with one line of arithmetic: milliamp-hours divided by 1,000, multiplied by the cell voltage, which is 3.7 volts on almost… Travel Himalaya Nepal · News Read the full story

What charging actually costs on the trail

You pay per device, and the price rises with altitude. A lodge at 2,600m runs off a village hydro line and charges little; a lodge at 4,900m is running a small solar array and a battery bank that has to last the night for everyone in the dining room, and the… Travel Himalaya Nepal · News Read the full story

The cold problem, which is bigger than the supply problem

A lithium battery loses capacity as it gets colder, and at altitude it gets very cold at night. A phone that showed 40% in the afternoon can be dead by breakfast if it spent the night on a bedside shelf at minus ten. The battery is usually not damaged; the… Travel Himalaya Nepal · News Read the full story

Solar, and what it really does

A folding solar panel works in the Himalaya, but not the way people expect. On a clear day above 3,000m the light is strong and a 20—30 watt panel can genuinely fill a power bank strapped to the outside of a pack. What it does not do well is charge a phone… Travel Himalaya Nepal · News Read the full story

Plugs, cables and the small failures

Nepal uses 230 volts, and sockets take European round pins and Indian-style three-pin plugs, so a universal adapter is the safe answer. Bring two cables, not one, because a frayed cable at 4,500m turns a working power bank into ballast and no lodge has a… Travel Himalaya Nepal · News Read the full story

What we would carry

For a trek of up to two weeks: one 20,000 mAh power bank, two cables, a multi-port charger and a universal adapter. That is enough for a phone, a headlamp that takes USB, and a camera, without paying for a single lodge socket. Add a second bank rather than a… Travel Himalaya Nepal · News Read the full story

Keep reading

What to download before you lose signal, and which apps work without it. Data, power, wifi safety, maps and the device rules, in one place. What to pack, and the rules people break by accident. Which network, what it costs and where to buy it. Which is really… Travel Himalaya Nepal · News Read the full story

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