Best Power Bank 2026: 10 Ranked on Real Delivered Capacity

Nothing else in this category comes close on evidence. A sample of 32,329 ratings at 4.6 is more than double the next largest, built up over years rather than a launch push, and for a product whose failure mode is a battery that quietly loses half its capacity in eighteen months, that depth of feedback is the most valuable thing on the page.

The specification is well chosen for what most people actually need. Twenty thousand milliamp hours is 74 watt hours of stored energy, delivering somewhere around 13,000mAh to your devices, which is three to four full phone charges. The 22.5W output with PD3.0 and QC4.0 charges a modern phone to about 61 percent in half an hour, and there are three ports so you can share it. Crucially the USB-C port works as both input and output, which a surprising number of rivals still get wrong, and it will charge low-current devices like earbuds and a smartwatch that many power banks simply ignore.

The three-year INIU Care warranty is the longest in this guide and unusual at this price. Like every listing here it publishes no watt hour figure, and like every listing here the printed 20,000mAh is the cell rating rather than what reaches your phone. At £22.41 it is also the cheapest 20,000mAh unit from a brand with real evidence behind it.

Look at the first bullet point and you will find a number no marketing department would invent: 3.79 charges of a Samsung Galaxy S24. That decimal is the sound of someone actually dividing delivered capacity by battery size rather than rounding upwards, and it is why we trust this listing more than any other here. Run the same sum yourself and a 20,000mAh pack delivering around 65 percent of its rating gives you almost exactly that.

The hardware backs it up. Thirty watts of output charges an iPhone 15 to 57 percent in half an hour, 20W input means the bank itself refills quickly, and the built-in USB-C cable is rated for 10,000 bends so you stop losing cables. ActiveShield 2.0 monitors temperature three million times a day and the cells carry CB certification to international safety standards, which almost nothing else in this search claims.

At £28.99 it costs £6.58 more than the INIU at number one, and the honest comparison is that you are buying the built-in cable, the extra 7.5W of output and the certification rather than more capacity. Both are 20,000mAh and both will deliver roughly 13,000mAh. The 18-month warranty is shorter than the INIU three years, which is the one place Anker loses.

The four integrated cables are the whole argument and they are a better one than they sound. Micro USB, USB-C and a Lightning-style connector are built into the body, plus a USB-A lead, so the commonest failure of a power bank, which is having it with you and the right cable at home, simply cannot happen. Add two USB-A ports and a USB-C port and it drives six devices at once, which is more than most units three times its capacity.

The capacity claim is honest and worth noting because so few here are. Charmast says up to two full charges for an iPhone 11 through 14 or a Galaxy S23. Ten thousand milliamp hours is 37 watt hours, delivering roughly 6,500mAh, and a modern iPhone battery is a little over 3,200mAh. Two charges is exactly right, and a less scrupulous listing would have said three.

At 10,000mAh it is genuinely pocketable and comfortably under any airline watt hour threshold. The trade-offs are that you get half the capacity of the 20,000mAh units for £6.27 less, and the listing does not state an output wattage in its bullets, so treat this as a top-up bank for a day out rather than a fast charger. The LED percentage display and three-year warranty are welcome at £16.14.

Two things make this the travel pick. First, it is 30 percent smaller than a standard 20,000mAh pack, which INIU says makes it more compact than some 10,000mAh alternatives, and on a product you carry every day that matters more than another five watts. Second, and more usefully, it is the only listing among the ten we pulled that mentions aeroplanes at all, describing itself as airplane-approved.

That is worth explaining, because the rest of the category is silent on it. A 20,000mAh pack holds 74 watt hours, comfortably below the 100 watt hour threshold most airlines apply to cabin baggage. A 30,000mAh pack holds 111 watt hours and sits above it. INIU is the only brand here that seems to have noticed its customers fly, and while you should still confirm with your carrier, the fact it is mentioned is a small mark of a listing written by someone thinking about use rather than specifications.

Forty-five watts of PD output takes a phone to roughly 70 percent in 25 minutes and covers Samsung Super Fast Charging, and the claim of four phone charges from 20,000mAh is the arithmetically honest figure. The built-in cable is nylon braided and bi-directional. At 4.4 from 8,563 ratings it scores slightly below the cheaper INIU at number one, which is the main reason it is not higher.

If you want a power bank that charges a laptop rather than just topping up a phone, this is where the list actually starts. One hundred and forty watts over USB-C with PD 3.1 is enough to run a MacBook Pro 16 at close to mains speed, and the second port still delivers 65W, so a laptop and a phone can charge together without either dropping to a trickle.

UGREEN also passes the honesty test convincingly. It quotes 5.2 charges of an iPhone 15, 3.6 of a Galaxy S23 Ultra and 1.3 of a MacBook Pro 16. Those are calculated numbers with decimals, not round marketing figures, and running the sum on 25,000mAh at roughly 70 percent delivered capacity produces almost exactly 5.2 iPhone charges. When a brand publishes three separate figures that all reconcile, it has done the arithmetic.

Two practical points. At 25,000mAh it holds 92.5 watt hours, which is under the 100 watt hour airline threshold but not by much, so it is the largest pack here we would happily fly with. And at 513g it is heavy, though UGREEN is right that this is light for the class. The 4.3 rating is the joint lowest in this guide, which on 7,488 ratings is a real if modest signal.

This is the power bank for someone who travels with a laptop, a tablet and a phone and does not want to think about any of them. Three USB-C ports each capable of 100W means you can run a MacBook and two other devices simultaneously without the shared-power throttling that spoils cheaper multi-port banks, and 165W total output is the highest in this guide by 25W.

The cable design is genuinely clever. One built-in USB-C cable extends to 2.3 feet and is rated for over 20,000 retractions, and the second doubles as a carrying strap, so the thing you use to charge is also the thing you use to hold it. With four devices connectable at once and 100W recharging that refills the bank itself quickly, it is the least fiddly large power bank here.

The cost is the price and the mass. At £69.99 it is £20 more than the UGREEN at number five for 25W more output, which is a poor rate of exchange unless you specifically need three 100W ports. It carries the same 92.5 watt hours as the UGREEN, so the same airline caveat applies. And with 11,494 ratings at 4.5 it is well evidenced, but Anker gives 18 months of warranty where INIU gives three years at a third of the price.

With 23,973 ratings this has the second deepest evidence pool in the search, and the claim in its first bullet is the most conservative of any listing here: three to five iPhone top-ups, three to four for Samsung. Run the numbers and 27,000mAh delivering around 65 percent gives roughly 17,500mAh, which against a 3,349mAh iPhone battery is 5.2 charges. JIGA has quoted a range that starts well below what the pack can actually do, which in this category is remarkable restraint.

The practical package is sensible for the money: two inputs including USB-C, three outputs, a four-plus-one segment LED indicator that tells you the state of charge properly rather than with four vague dots, a built-in torch, and 22.5W Quick Charge 4.0 output. At £24.99 that is a lot of capacity per pound.

Two things hold it at seven. The 4.2 rating is the lowest in this guide, and from nearly 24,000 ratings that is a real signal about consistency rather than statistical noise. And at 27,000mAh it holds 99.9 watt hours, which is fractionally under the 100 watt hour threshold most airlines apply, so it is technically fine to fly with but leaves you no margin at all if a carrier measures it differently. If you fly often, the 20,000mAh units at 74 watt hours are the safer choice.

Belkin is a genuine accessory brand with retail presence and proper support, and at £21.99 with a two-year warranty this is the cheapest way to get that reassurance in a 20,000mAh pack. Three ports, one USB-C and two USB-A, cover a phone, a tablet and a pair of earbuds, a short cable is included, and it arrives pre-charged so it works out of the box.

It also describes its capacity differently from everything else here, quoting 78 hours of additional smartphone battery life rather than a number of charges. That is a softer unit and harder to check, since it depends entirely on what the phone is doing, but it is at least not an inflated charge count.

The problem is output. Fifteen watts maximum is the lowest figure in this guide by 7.5W, and less than half the Anker Zolo at number two which costs £7 more. In practice that means a modern phone charges at roughly conventional speed rather than fast, so a top-up that takes half an hour on the Anker will take appreciably longer here. For overnight use or a slow trickle in a bag it is irrelevant; for a quick boost before going out it is the whole difference. Buy this for the brand and the warranty, not the speed.

On format this is appealing. Four integrated cables covering iPhone, Micro USB, USB-C and USB-A, plus two USB-A ports and a USB-C port for six devices at once, in a body 2.3cm thick and 11.6cm long that the listing compares to a passport. Add a silicone lanyard, 22.5W PD3.0 and QC4.0 charging, a stated six-layer safety system and a three-year warranty, and at £27.99 with 5,624 ratings at 4.5 it looks like strong value.

Then you check the claim. The second bullet promises six to seven full charges for an iPhone 15, 16 or 17. Those phones carry batteries of roughly 3,350 to 3,600mAh. A 27,000mAh pack delivers around 17,500mAh once the 3.7 volt cells have been stepped up to 5 volts and conversion losses taken, so the honest figure is a little over five charges. Six to seven overstates it by roughly a quarter, and the JIGA at number seven, with the same capacity and a much larger review sample, quotes three to five.

The other tell is a single word. The bullet describes it as a genuine 27000mAh power bank. Manufacturers reach for words like genuine and real when a category has a credibility problem, and inserting one here does not make the charge count add up. The hardware looks good; the number does not.