Skip to content
Write a review

Buying Guide Power Banks

How to Choose a Power Bank

Quick answer

Pick capacity by how many charges you need, check the output watts for your laptop or phone, stay under 100 Wh if you fly, and buy a known brand to avoid fakes.

By Buyzello Editorial Team 1 min read

We research products independently. When you buy through links on this page, we may earn a commission at no extra cost to you. How we earn money

Capacity in plain terms

A 10,000 mAh bank charges most phones about twice. A 20,000 to 25,000 mAh bank charges a phone four or five times, or a laptop about once. Bigger capacity means more weight, so buy what you will actually carry.

Watts decide speed

  • 20W to 30W: fast charging for phones
    – 45W to 65W: tablets and thin laptops
    – 100W to 140W: larger laptops such as a MacBook Pro

Flying with a power bank

The FAA allows power banks up to 100 Wh in carry-on bags only. Check the Wh number printed on the bank. Most 25,000 mAh models are just under the limit.

Extras worth paying for

  • A built-in cable for everyday carry
    – A display that shows remaining charge
    – Pass-through charging so the bank and phone charge overnight from one outlet

Our picks

See all our best power banks for more options.

Frequently asked questions

What does mAh mean?

Milliamp-hours measure capacity at the battery's internal voltage. Watt-hours are a better comparison across devices and are what airlines use.

Why does my power bank deliver less than its rating?

Energy is lost converting voltage and as heat, so expect about 60 to 70 percent of the rated capacity to reach your phone.

How long do power banks last?

Most keep good capacity for 300 to 500 full cycles, or about two to three years of regular use.

Buyzello Editorial Team

Part of the Buyzello research team. We compare specifications, documentation and real-world trade-offs so you can decide faster.

How we test and score Editorial policy

How to choose power banks: the short version

Pick capacity by how many charges you need, check the output watts for your laptop or phone, stay under 100 Wh if you fly, and buy a known brand to avoid fakes. This power banks buying guide explains the features that matter, the ones you can ignore, and which models we would buy or skip.

Our shortlist: the Anker 737 Power Bank ($89–$149) for laptops and travel. the Anker Nano Power Bank ($29–$45) for everyday carry. the INIU Portable Charger 10000mAh 22.5W ($17–$25) for budget.

How much should you spend on power banks? Budget models start around $17, while premium options reach $149. Spending more usually buys 140W output that can charge a laptop and built-in cable means you never forget one, but it is only worth it if you will use those features.

Capacity: 10,000 mAh fills most phones about twice; 20,000 mAh or more suits laptops and long trips. Output: phones need 20W to 30W, while laptops usually need 45W to 100W over USB-C. Airline rules: the FAA allows power banks up to 100 Wh in carry-on bags, never in checked luggage.

Usually about twice for a modern phone, because some energy is lost as heat and battery conversion. Yes, in your carry-on. The FAA allows lithium power banks up to 100 Wh without approval, and they are not allowed in checked bags.

Buy power banks from the brand's official Amazon store or listings sold by Amazon, because counterfeit chargers are common. Check the watt-hour rating if you fly, and look for UL or similar safety certification.

Across the power banks we cover, typical prices run from $17 to $149. Store prices change often, so treat these as typical ranges and check the current price before you buy.

At around $59–$89, the Anker MagGo Power Bank suits shoppers who want snap-on Qi2 wireless charging. Owners and specs point to strong magnetic hold and qi2 15W wireless charging, while wireless charging wastes some energy as heat is the catch.

Where many readers begin: Our top-rated choice among power banks is the Anker 737 Power Bank, valued for 140W output that can charge a laptop. Our top-rated choice among phone chargers is the UGREEN Nexode 65W USB-C Charger, valued for charges a laptop, phone and earbuds from one brick. Shoppers comparing game consoles often start with the Nintendo Switch 2, which typically sells for $449–$499. Our top-rated choice among game controllers is the Sony DualSense Wireless Controller, valued for immersive haptics and adaptive triggers. Every pick links to stores in your country, and prices shown are typical US ranges for comparison rather than live quotes.