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Anker 525 PowerCore 20K review

A research-led verdict on the Anker 525 PowerCore 20K: who it suits, what the published specs mean in practice and where it falls short.

8.6/10 Typical price: £40–£60 Last updated: 6 November 2026
Anker 525 PowerCore 20K product image
Anker 525 PowerCore 20K. Image is illustrative; check the retailer for the exact model and finish.
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Verdict

The Anker 525 PowerCore 20K is the pack you buy when one charge is not enough. The 20,000mAh capacity is enough for several phone charges, and the 20W USB-C PD output plus two USB-A ports means you can top up more than one device at once. The capacity is the point: this is a pack for a weekend away, a festival, a long train journey or a household that wants a reserve for power cuts.

The cost is weight and size. At around 350 g it is noticeably heavier than a 10,000mAh pack, and it will take up more room in a bag. There is no wireless charging and no display, so you are relying on LED indicators. Charging the pack itself takes time because the input is not high-wattage. Those are reasonable compromises at the price.

The 525 is not a pocketable everyday carry; it is a reserve. If you want a slim pack for a commute, the 621 MagGo is the better shape. If you want a pack that can keep a phone, a tablet and a pair of earbuds alive for a weekend, the 525 does it without costing much more than the smaller pack. Buy it for capacity, not for portability. The 20W output is fine for a phone but not for a laptop, so do not buy it expecting to power a MacBook. It is also worth checking airline rules before taking a 20,000mAh pack on a flight; most airlines allow it in cabin baggage, but policies vary.

What we like

  • 20,000mAh capacity for multiple charges
  • 20W USB-C PD output
  • Two USB-A ports plus USB-C
  • Good value for the capacity

What we do not

  • Heavier and bulkier than a 10,000mAh pack
  • No wireless charging
  • Charging the pack itself takes time
  • No display

Key specifications

Capacity20,000 mAh
ChargingUSB-C
DisplayNo
Output20 W USB-C PD; 2x USB-A
Pass-through chargingYes
Ports1x USB-C, 2x USB-A
WeightAround 350 g

Figures are manufacturer claims unless stated otherwise. We do not present them as independent measurements.

Best for

  • Travellers who need several days of phone charge
  • Festival-goers and campers
  • Households that want one pack for multiple devices

Skip if

  • You want a pocketable everyday pack
  • You need high-wattage laptop charging
  • You want wireless charging

Buying questions

Is the Anker 525 PowerCore 20K worth it?

At a typical price of £40–£60, the Anker 525 PowerCore 20K is aimed at travellers who need several days of phone charge. If that describes you, it is worth considering. Skip it if you want a pocketable everyday pack.

What are the main drawbacks of the Anker 525 PowerCore 20K?

The main compromises are heavier and bulkier than a 10,000mAh pack; no wireless charging; charging the pack itself takes time; no display. None of them is unusual for this category and price band, but they are the reasons to think twice before buying.

Who should skip the Anker 525 PowerCore 20K?

Skip it if you want a pocketable everyday pack; you need high-wattage laptop charging; you want wireless charging. The power banks roundup compares it with the alternative we cover.

Anker 621 MagGo Power Bank vs Anker 525 PowerCore 20K — the head-to-head for this category.