Best Power Banks of 2026: Charge Anything, Anywhere

What the mAh Number Actually Means

A 20,000 mAh power bank will not give you 20,000 mAh. Energy conversion burns roughly 30-40% of the rating, so expect 60-70% of the stated capacity to reach your device: a 20,000 mAh unit behaves like a 12,000-14,000 mAh one in real use. That is physics, not a brand defect.

It is also the first thing cheap listings exploit. The cheapest power banks advertise capacities they cannot sustain -- the number on the box is marketing, the cell inside is the real spec. Wattage and brand matter more than the label.

Capacity: Buy for Charge Counts, Not Labels

Capacity is measured in milliamp-hours, but you should shop in charges:

• 5,000 mAh: roughly one full phone charge. Pocket-sized, an emergency backup, nothing more.
• 10,000 mAh: two phone charges or one tablet charge. The sweet spot for daily carry.
• 20,000 mAh: four to five phone charges, or two charges for a USB-C laptop. Travel and camping territory.
• 26,800 mAh and up: a laptop, tablet, and phone several times over. You pay in weight and bulk.

If you charge one phone a day, 10,000 mAh is the rational buy. Everything above it is a trade: you are hauling grams so you do not have to find a wall socket.

The Wattage Trap Is the Real Mistake

Capacity mistakes are forgivable. Wattage mistakes leave you with a dead laptop mid-presentation. Three standards dominate listings:

• USB Power Delivery (PD): the universal USB-C standard, up to 240W for laptops and 20W+ for phones. Apple, Samsung, and Google phones all speak it.
• Quick Charge 3.0/5.0: Qualcomm's standard, common on Android, up to 100W on QC 5.0.
• VOOC/SuperVOOC: Oppo and OnePlus proprietary, up to 150W, and useless outside compatible devices.

Here is the rule that saves the most money: a 20W power bank cannot charge a MacBook that draws 60W or more. It will trickle, or not charge at all while the laptop is on. Match output to your most demanding device before you even look at capacity.

Four Picks, by the Numbers

Anker 737 -- best overall. 24,000 mAh, 140W PD output, enough to run a MacBook Pro at full speed, and a digital display of remaining capacity and charge time. At around 90 EUR it is the most complete unit here -- and the most expensive. The trade-off is in the price: 90 EUR is real money for a battery, and 24,000 mAh means this is a bag unit, not a pocket one.

Mophie Powerstation Plus -- best compact. 5,000 mAh with a built-in cable, so there is nothing to forget at home. What you get is exactly one phone charge. It is an emergency backup, not a travel companion -- buy it for the pocket, not the trip.

Nitecore NB10000 Gen 2 -- best for travel. 10,000 mAh at 150 grams, 45W PD, airline-safe. For hikers and flyers who count every gram, this is the rational 10,000 mAh pick. The trade-off is in the specs: 45W will not feed a demanding laptop, so it is a phone-and-tablet unit that happens to be light.

Goal Zero Sherpa 100AC -- best high-capacity. 19,200 mAh with a real AC outlet, 100W USB-C PD, and Qi wireless charging -- one unit can power a laptop, a camera, and a drone. The cost is physical: an AC inverter plus 19,200 mAh of cells makes it the heaviest, least pocket-friendly unit here. You carry it because outlets are not available, not for daily commuting.

More options sit in the catalog -- browse the product categories and compare wattage per port before you click.

The Airline Rule: 100 Wh Is the Line

Airlines treat power banks as lithium cargo, and the numbers are strict: anything over 100 Wh -- about 27,000 mAh at 3.7V -- requires airline approval, and anything over 160 Wh is banned from passenger aircraft. Almost every bank under 26,800 mAh clears the 100 Wh line and rides in hand luggage.

Never pack a power bank in checked baggage. The lithium-battery fire risk in a cargo hold is the one rule with no exceptions, and no capacity is worth it.

Buy in This Order: Wattage, Capacity, Price

Check your most demanding device first. If it is a laptop drawing 60W or more, a 20W bank is a paperweight for that job -- buy 100W PD or drop the laptop-charging claim. Then pick capacity by charge count, not label: 10,000 mAh for daily carry, 20,000 mAh for trips, 26,800 mAh only if you genuinely leave the grid. Keep it under 100 Wh, and keep it out of checked luggage.