Avoid if
- Not for small spaces where the listed footprint or clearance is a hard constraint.
Product profile
Anker 335 Power Bank 20000mAh
Brand: Anker
A dependable mainstream alternative for shoppers who prioritise brand familiarity and long-term ownership confidence.
First published: 31/03/2026 · Product details reviewed: 31/03/2026
Review dates are recorded updates rather than continuous monitoring.
How this profile was reviewed
Criteria-based comparison
A comparison with stated criteria, trade-offs, attributable sources and reasons for each recommendation.
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Not for you if / Check before buying
These checks summarise the information used in our buying guides. Confirm final details with the retailer before buying.
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
Key specifications to check
| 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. |
See this product compared in
- Best Budget Power Banks in the UK (2026): Value and Capacity Checks · Best specialist or alternative · Pick 4
- Best Compact Power Banks in the UK (2026) · Best specialist or alternative · Pick 4
- Best Compact USB-C Power Banks in the UK (2026) · Best specialist or alternative · Pick 4
Pros and trade-offs
Pros
- Reliable high-capacity everyday backup
- Trusted mainstream accessory ecosystem
Cons
- Heavier than compact 10000mAh units
Where to check it
Check current details
Search Amazon for this modelOpen the result and confirm the exact model, seller, delivery, returns and fit before buying.
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