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In-depth review

Anker 335 Power Bank (PowerCore 20K) Review (2027)

Three ports, 20,000mAh and a budget price make the Anker 335 the family pack. Our research-based verdict on its limits and its value.

TGBy TrueGear Research TeamIndependent editorial teamLast updated How we researchResearch-based assessment · Power Banks
Specs verified against manufacturer docs
No paid placements
Independently funded by readers
Updated 2026-11-01
Anker 335 Power Bank (PowerCore 20K) Review (2027) featured graphic
Anker Anker 335 Power Bank (PowerCore 20K)

Anker Anker 335 Power Bank (PowerCore 20K)

The plain, dependable 20,000mAh family pack: three ports, no display drama, no laptop pretensions.

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Our verdict

The 335 is gloriously unambitious, and that is its virtue. It does not charge laptops, it has no display worth discussing, and it will not impress anyone at a spec-sheet contest. What it does is keep a family's phones alive for days from one inexpensive brick with three ports, and it does that without fuss, apps or surprises. For phone-first households, that is the whole job, and the 335 does it for less than any laptop pack here.

What we like

  • 20,000mAh capacity, rated by Anker at over 4 iPhone 13 charges or over 3 Galaxy S22 Ultra charges
  • Three ports, two USB-A and one USB-C, charge a phone, earbuds and a watch at once
  • Maker-quoted iPhone 13 charge to 50% in 37 minutes on the fast port keeps top-ups practical
  • Simple LED-free approach with a familiar brick shape that survives bag life without fuss

What to watch out for

  • 22.5W max output will not meaningfully charge a USB-C laptop, and tablets charge slowly
  • At 6.57 inches long and 1.07 lb it is a big slab for a phone-only pack
  • Recharging a 20,000mAh pack through a modest input takes patience, so overnight refills are the norm

What owners report: Anker Anker 335 Power Bank (PowerCore 20K)

Synthesized from recurring themes in long-term owner feedback.

Most praised

  • Families keep it in a shared bag because three ports end the nightly argument over the one charger
  • It quietly covers a long weekend of phones without ever visiting a wall outlet
  • Owners praise the lack of gimmicks: it charges, it lasts, and it does not demand attention

Common complaints

  • Buyers who assumed any 20,000mAh pack charges a laptop are disappointed by the slow tablet and laptop speeds
  • The long slab shape fits awkwardly in small jacket pockets and cup holders
  • Refilling the pack itself feels slow after the convenience of its multi-day phone output

Who it is for

Families, phone-first travellers and anyone who wants days of phone power from one shared brick.

Capacity is the product

20,000mAh at a budget price buys something no 10,000mAh pack can: indifference to outlets. Anker quotes over four iPhone 13 charges or over three Galaxy S22 Ultra charges, which covers a family weekend or a long travel day with change to spare. The three ports mean the capacity is shared rather than rationed, so a phone, earbuds and a watch can all charge from one brick while the family shares one outlet.

22.5W is a phone number, not a laptop number

The honest limit is wattage. At 22.5W max, phones charge at a decent pace and an iPhone 13 reaches 50% in about 37 minutes on the fast port, per Anker, but tablets crawl and laptops barely notice. Buyers who expected a big battery to mean big power are the 335's only disappointed owners, and the disappointment is a category misunderstanding rather than a product failure.

Size and the overnight refill

At 6.57 inches and 1.07 lb the 335 is a long slab, and it fits a bag far better than a pocket. Refilling 20,000mAh through a modest input is an overnight job, so the rhythm of owning it is simple: use it for days, plug it in at night, repeat. For a shared household pack that rhythm is fine; for a daily commuter who needs a fast turnaround, a 10,000mAh pack with a faster input fits better.

Key specifications

Capacity
20,000mAh
Max output
22.5W
Ports
2 x USB-A, 1 x USB-C
Model
A1288 (335 Power Bank)
Size
6.57 x 3.28 x 0.96 in
Weight
1.07 lb (listing)

Also consider

Research-based assessment. TrueGear has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.

Questions, answered

Can the Anker 335 charge a laptop?

Not meaningfully. Its 22.5W max output is designed for phones, earbuds and watches, and a USB-C laptop will charge extremely slowly or not at all under load. Laptop owners should buy a 65W or 100W pack instead, such as the UGREEN Nexode 100W in this guide.

How many devices can it charge at once?

Three: two USB-A ports and one USB-C port. Total output is shared across them, so three devices charge together at moderate speeds rather than each at the 22.5W maximum.

How long does the 335 take to recharge?

Expect an overnight refill. A 20,000mAh pack on a modest input takes several hours, so the practical routine is to plug it in at night. If fast turnaround matters, a smaller pack with a higher-wattage input, like the INIU P50, refills far quicker.

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