UK Shortlists home UK Shortlists

Product profile

Anker 335 Power Bank 20000mAh

Anker 335 20,000mAh power bank product image

Brand: Anker

Best fit for many buyers balancing route-fit practicality, ownership friction and value.

Published: 31/03/2026 · Substantive review: 31/03/2026

Merchant check: 31/03/2026 · Spec check: 31/03/2026 · Last significant change: 02/06/2026

Dates reflect recorded editorial review cycles, not continuous live monitoring.

Review basis across routes

Evidence-supported comparison

Structured comparison with explicit criteria, trade-offs, source signals, and evidence-backed winner rationale.

Category context:

Not for you if / Check before buying

These caveats come from currently published product evidence and are not defect or safety labels.

Avoid if

  • Not for small spaces where the listed footprint or clearance is a hard constraint.

Check before buying

  • Does not include wall charger in the box.
  • Confirm exact model, capacity, USB-C PD/output wattage, port mix, supplied cables and seller terms before checkout.
  • For travel, check the Wh rating and the current airline or airport rules for your route rather than assuming acceptance.
  • For laptops, tablets or handheld consoles, confirm the device wattage requirement and cable rating before relying on fast charging.

Best for / Not for you

Best for

  • General-use all-round power bank buyers

Not for you if

  • Ultra-light carry-first buyers

Verified specs

Spec Value
Capacity 20000mAh
Max output 20W
USB-C output Not yet verified
Airline safe Not yet verified
Output ports USB output port mix is route-relevant; verify exact USB-C/USB-A count, simultaneous-output behaviour and cable requirements on the current model listing before buying.
Input charging Recharge/input method and input wattage are route-relevant; verify the exact model listing and supplied cable or charger requirements before buying.
Weight and portability notes Treat as a higher-capacity pack; confirm current listed weight, dimensions and bag/pocket fit before purchase.
Device fit notes Match the power bank output, USB-C PD support, cable rating and port mix to your exact phone, tablet, handheld console or laptop requirements before buying.

Current route appearances

Award roles across routes: Best overall, Best premium, Best specialist or alternative

Cluster routes to compare next

Use these linked routes to move between main and needs-specific angles before final checkout.

Pros and cons from route evidence

Pros

  • Reliable high-capacity everyday backup
  • Trusted mainstream accessory ecosystem

Cons

  • Heavier than compact 10000mAh units

Current merchant links

Priority next action

Check on Amazon

Need shortlist context first? Best Power Banks in the UK (2026)