Belkin UltraCharge Pro Slim Magnetic Power Bank 5K

Last updated: 13 September 2026

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What a semi-solid-state cell actually is

Ordinarily a power bank runs a lithium cell with a liquid electrolyte in it. A true solid-state cell, by contrast, replaces that liquid entirely. But BoostSolid does neither: Belkin's own wording is that it "adds a gel-like layer alongside the liquid electrolyte". So the liquid is still in there, and this is not a solid-state battery. Belkin does not claim it is one, and neither should anyone selling it to you.

The gel layer is what lets Belkin build the pack thinner while keeping the capacity. Equally, it is the basis of the safety argument. Belkin says the architecture reduces the risk of thermal runaway, fire and swelling. It also says dual analog and digital temperature sensors watch the cell continuously and cut power if it goes outside its limits. Beyond that, the pack is designed to meet UL2056:2025 requirements and TSA carry-on guidance. Belkin also lists nail puncture, high heat, extreme cold, drop and vibration among the tests it survived.

The Belkin UltraCharge Pro 5K is 8.8mm thick, or 8.4mm, depending which Belkin page you read

Thinness is the entire pitch here, so the figure matters. First, Belkin's press release says 8.8mm. The bullet list at the top of Belkin's own UK product page says 8.8mm too. But the technical specifications table further down that same page gives the dimensions as 104 x 72 x 8.4mm. Belkin's Amazon UK listing says 8.4mm as well.

So Belkin contradicts itself, on one page, by 0.4mm. Nobody will notice 0.4mm in a pocket. Still, a launch specification stays marketing copy until somebody measures the object. That applies to the numbers a maker publishes about its own product too.

Otherwise the physical description is consistent. For instance, it is 104mm long and 72mm wide, which is roughly a credit card with a bit more height. Meanwhile Amazon lists it at 190g. The housing is metal with a soft-touch finish, and the plastic parts are at least 52% post-consumer recycled. Instead of a screen there is an LED battery status indicator. A 0.6m braided USB-C to USB-C cable comes in the box.

Charging speeds, and the 22.5W question

Wirelessly it is Qi2-certified at 15W. Wired, Belkin's press release and its UK product page both say 22.5W over USB-C, while the Amazon listing says 20W. In fact the footnote explains why both are true. The port "provides 22.5W under SFC protocol, and up to 20W under PD protocol". Specifically, SFC is Samsung's fast-charge standard. So an iPhone charging over Power Delivery sees 20W, and the 22.5W headline belongs to a narrower set of phones.

Pass-through charging works at 7.5W wirelessly. So you can leave the bank plugged in with a phone on the back of it, slowly. Belkin's Amazon copy also adds one claim the press release does not make: 0 to 50% on an iPhone in 40 minutes over the magnets.

What 5,000mAh gets you

Belkin's own disclaimer does the useful work here. The pack "contains a 5,000 mAh internal battery", it says, and the "amount of discharge to user's device is less". Meanwhile a modern phone battery sits somewhere near 3,500 to 4,700mAh, and conversion losses eat a chunk of what the pack holds. So this is about one full phone charge, not a weekend away.

That is the right size for the job it is built for. It snaps on the back of a phone, adds 8.8mm and 190g, and gets you through an evening. Anyone charging a tablet, or charging a phone twice, wants the UltraCharge Pro 10K instead. That one drops the magnets and trades them for 60W over USB-C and a display.

The 3x longer claim, and the footnote under it

Belkin says the UltraCharge Pro range is "engineered to last up to 3x longer than other power banks". The asterisk then leads to the definition. The pack retains up to 80% of its capacity after 1,000 charge cycles. And the estimated five-year lifespan "assumes one full charge/discharge cycle every two days".

Read that second half again, because it is doing the work. Five years only arrives if you flatten and refill this power bank 182 times a year. Most people charge a 5K pack once or twice a week. At that rate 1,000 cycles is a decade or more away, and the pack will fail some other way first. Even so, the cycle rating is a genuine engineering claim, and 80% after 1,000 cycles is good. The five-year headline attached to it is arithmetic about a user who does not exist.

Colours, warranty and packaging

Both colours, Black and Sand, cost £59.99, and both are on Belkin's UK site. Belkin gives a two-year warranty on the product itself. Alongside that sits a £1,500 Connected Equipment Warranty, which covers repairing or replacing a device damaged by an electrical fault while properly connected to the pack. Finally, the packaging is plastic-free.

Belkin UltraCharge Pro 5K specifications

Where to buy the Belkin UltraCharge Pro 5K

Belkin sells it directly at belkin.com/uk in both colours. Indeed both were showing Add to Cart rather than a pre-order button when this page was checked. Meanwhile Amazon UK lists the same two colours at the same £59.99, with a release date of 16 September 2026. So an Amazon order placed before that date is a pre-order rather than a dispatch.

For reference, the Amazon ASINs are B0HFJKZ9Z7 for Black and B0HFJS1LVW for Sand.

Pre-order Black on Amazon, £59.99 Pre-order Sand on Amazon, £59.99 Buy direct from Belkin UK

Belkin UltraCharge Pro 5K FAQs

How much does the Belkin UltraCharge Pro 5K cost in the UK?

It is £59.99 in Black and £59.99 in Sand, both on belkin.com/uk and on Amazon UK. Belkin, however, ships direct now. Amazon's release date is 16 September 2026, so orders placed there before that are pre-orders.

Is BoostSolid a solid-state battery?

No, and Belkin does not say it is. BoostSolid is semi-solid-state, because it adds a gel-like layer alongside the liquid electrolyte instead of replacing the liquid. A true solid-state cell, by contrast, has no liquid electrolyte at all. So anyone describing this pack as solid-state has skipped a word that changes the meaning.

How many phone charges will 5,000mAh give me?

Roughly one. Specifically, Belkin's own small print says the amount delivered to your device is less than the 5,000mAh in the pack, because conversion losses take a share. Most current phones hold between 3,500 and 4,700mAh. So plan for one charge, and treat anything beyond that as a bonus.

Does it work with an iPhone without a MagSafe case?

Yes. It is Qi2-certified with its own magnets. Belkin lists compatibility with Qi2-enabled and MagSafe-compatible devices, naming the iPhone 15, 16 and 17 families and the iPhone Air. For wired charging Belkin also lists Samsung Galaxy S23 to S26, Google Pixel 7 and 8, and both Nintendo Switch models.

Is the wireless charging as fast as the cable?

No. Qi2 runs at 15W here, while the USB-C port does 22.5W under SFC or up to 20W under Power Delivery. Wireless charging also loses more energy as heat, so less of the pack reaches your phone. In short, the magnets are for convenience and the cable is for speed.

What does the two-year warranty actually cover?

Belkin gives two years on the power bank itself. Separately, its Connected Equipment Warranty covers a device damaged by an electrical charge while properly connected to the pack. In that case the cover runs to £1,500. Further details sit on Belkin's own warranty pages.

Is there a review of it on CoolCuration?

Not yet. This page is the factual reference: the prices, the specifications and the conflicts between Belkin's own sources. A separate opinion piece with a Cool Factor score follows once we have lived with one for three or four weeks. An explainer on what semi-solid-state cells change across the whole category follows on 20 September 2026. Until then, our service guides hold the rest of the reference layer.

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Prices, stock and release dates move. Everything here was checked on 13 September 2026. The sources were Belkin's press release of 3 September 2026, Belkin's UK product pages for BPD024hqBK and BPD024hqSA, and Belkin's Amazon UK listings B0HFJKZ9Z7 and B0HFJS1LVW.

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