Laptop Power Banks

A power bank big enough for a laptop

Most power banks are made for phones. A laptop needs much more power at once, at a higher voltage, and a small phone power bank will charge it very slowly if at all. The power banks here are made for laptops: each has a USB-C port with USB Power Delivery at laptop power, and enough stored energy to make carrying it worthwhile. They suit commuters, students between lectures, and anyone who works on trains or in airports.

What you will find here

• Capacities mostly from 20,000mAh to 27,000mAh, with a smaller version of one.
• USB-C output from 65W to 140W from one port, with higher totals across all the ports when several devices charge at once.
• Built-in USB-C cables on several, so the cable cannot be left behind, one doubling as a carrying strap.
• Displays that show the charge left and the watts going in or out.

How to choose: watts, then capacity

The watts say how fast it gives power. Match the figure on your laptop's own charger from one USB-C port, and the laptop charges at about its usual speed. Less still helps, more slowly, and works best with the lid closed. Use a cable rated for the watts: above 60W, a USB-C cable rated 100W or 240W.

The capacity says how much it holds. It is printed in mAh at the cells' own voltage, about 3.6 to 3.7 volts, so turn it into watt-hours to compare with a laptop battery: volts times mAh, divided by 1,000. A 20,000mAh bank at 3.7 volts holds about 74Wh. Some energy is lost as heat on the way, so expect less than the label suggests reaches the laptop. The laptop maker's specification page gives its battery in watt-hours.

Flying with a laptop power bank

The UK Civil Aviation Authority's rules from 27 March 2026: power banks go in hand luggage, never the hold; no more than two per person; up to 100Wh without asking the airline, over 100Wh and up to 160Wh only with its approval. A power bank must not be recharged on board and should not be used to charge other devices there. The larger banks here are made to sit just under 100Wh; check the watt-hours printed on the one you choose, and your airline's own rules.

Questions people ask about laptop power banks

Can any power bank charge my laptop?

No. It needs USB Power Delivery at enough watts from one USB-C port.

What if mine swells or gets hot?

Stop using it at once. The CAA says damaged or swollen batteries must never be carried on an aircraft.

Delivery is included in every price and tracked to your door.

More to look at

• Car laptop chargers
• USB-C to USB-C laptop cables
• USB-C laptop chargers
• Tech pouches
• For travellers
• Guide: Charging a laptop on the move: power banks and car chargers
• Guide: How to choose a laptop sleeve or bag: the UK buying guide