Best Portable Charger for Samsung Galaxy S8 (2026): 4 USB-C Picks

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Last updated 21 October 2026 | 10 minute read | Specs read from Amazon listings on 21 October 2026

The best portable charger for the Samsung Galaxy S8 is the INIU 10,000mAh 45W. The S8 has a USB-C port and a 3,000mAh battery, so a 10,000mAh bank charges it about twice. The INIU holds 4.4 stars from more than 88,000 owners and has a 3-year warranty.

This guide compares six USB-C power banks that suit the S8. We explain how many charges to expect, why a faster bank will not necessarily charge an S8 faster, and how to get the best from an older phone battery.

As an Amazon Associate we earn from qualifying purchases. This does not change what you pay.

Quick answer

Best portable chargers for the Samsung Galaxy S8: six USB-C power banks and what each is best for

Comparison table

Model Capacity Max output Weight Best for Score
INIU 10,000mAh 45W 10,000mAh 45W 8.1 oz Best all-round 4.4
Anker 10,000mAh 30W 10,000mAh 30W 7.9 oz Trusted brand 4.1
Anker Nano 30W 10,000mAh 30W 7.6 oz Built-in cable 4.2
Anker PowerIQ Slim 10,000mAh 15W 8.5 oz Slim and simple 3.6
INIU 20,000mAh 22.5W 20,000mAh 22.5W 12.7 oz Trips, 4 charges 3.8
Anker Zolo 20,000mAh 30W 20,000mAh 30W 12.5 oz Fast big bank 3.6
Weight chart of six power banks for the Samsung Galaxy S8 from 7.6 to 12.7 ounces

Best power banks for the Galaxy S8: six picks

All six are in stock on Amazon with at least 4.4 stars and more than 7,000 ratings. All have USB-C output, which is what the S8 uses. Scores use the formula in the scoring section below.

1. INIU 10,000mAh 45W Portable Charger: best for the Galaxy S8 overall

This is the bank we would buy for an S8. It holds enough for about two full charges of the S8’s 3,000mAh battery, weighs 8.1 ounces and is about half an inch thick. Its 3-year warranty is the longest of the 10,000mAh options.

The 45W output is more than the S8 can use, but it is useful if you later upgrade your phone or charge a tablet. It has more than 88,000 ratings at 4.4 stars.

Score: 4.4 out of 5 (portability 4, output 5, warranty 4, owner rating 4.4)

Pros

  • About 2.2 S8 charges
  • 3-year warranty
  • 88,000+ ratings
  • Slim at 8.1 oz

Cons

  • 45W is more than the S8 needs
  • Cable not built in
  • Phone-only users could pay less for a simpler bank

What owners say: Owners praise the build, the warranty and how small it is. The usual complaint is that it gets warm at the highest output.

Buy it if you want one reliable bank that will still work when you change phones. Skip it if you want a cable built in.

See the INIU 10,000mAh 45W on Amazon →

2. Anker 10,000mAh 30W Power Bank: trusted brand pick

A simple 10,000mAh Anker with 30W USB-C output. It weighs 7.9 ounces and holds 4.5 stars from more than 15,400 ratings. The warranty is 18 months.

For an S8, 30W is more than enough and gives you about 2.2 phone charges.

Score: 4.1 out of 5 (portability 5, output 4, warranty 3, owner rating 4.5)

Pros

  • 7.9 oz
  • 4.5 stars from 15,000+ ratings
  • 30W USB-C
  • Known brand

Cons

  • 18-month warranty
  • No built-in cable
  • Shorter warranty than INIU

What owners say: Owners like the size and the brand’s reliability. Complaints are few and mostly about wanting more capacity.

Buy it if you prefer Anker and want a no-fuss bank. Skip it if you want the longest warranty.

See the Anker 10,000mAh 30W on Amazon →

3. Anker Nano 10,000mAh 30W with Built-in USB-C Cable: built-in cable

The Nano has a USB-C cable built in, which suits the S8 perfectly because the S8 uses USB-C. It weighs 7.6 ounces, the lightest here, and has a 24-month limited warranty. It holds 4.4 stars from about 10,400 ratings.

The built-in cable cannot be replaced, so it is a trade between convenience and long-term flexibility.

Score: 4.2 out of 5 (portability 5, output 4, warranty 3.5, owner rating 4.4)

Pros

  • Built-in USB-C cable
  • 7.6 oz, the lightest
  • 24-month warranty
  • 30W output

Cons

  • Cable cannot be replaced
  • Only fits USB-C devices directly
  • Fewer ratings than INIU

What owners say: Owners love not carrying a cable. A few mention worry about wear over time.

Buy it if you want the simplest setup for an S8. Skip it if you also charge devices that need a different cable.

See the Anker Nano 10,000mAh on Amazon →

4. Anker PowerIQ Slim 10,000mAh Power Bank: slim and matches S8 speed

This slim bank has a USB-C port that charges at up to 15W, which is about what the S8 can use for fast charging. It weighs 8.5 ounces and has 4.5 stars from about 7,800 ratings. The warranty is 18 months.

It is the slowest bank here for newer devices, but for an S8 it is a good match.

Score: 3.6 out of 5 (portability 4, output 3, warranty 3, owner rating 4.5)

Pros

  • Slim body
  • 15W matches S8 fast charging
  • 4.5 stars
  • Scratch resistant

Cons

  • Slowest output here
  • 18-month warranty
  • Fewer ratings than INIU

What owners say: Owners like the thin design. Complaints are about speed, which does not apply as much to an S8.

Buy it if you only charge an S8 and want a slim bank. Skip it if you also charge a tablet or a newer phone.

See the Anker PowerIQ Slim on Amazon →

5. INIU 20,000mAh 22.5W Portable Charger: best for trips

For trips and festivals, the INIU 20,000mAh gives about four full S8 charges. It weighs 12.7 ounces, has a flashlight and a 3-year warranty, and holds 4.6 stars from more than 29,400 ratings.

It is heavier than the 10,000mAh banks, so keep it in a bag.

Score: 3.8 out of 5 (portability 3, output 3.5, warranty 4, owner rating 4.6)

Pros

  • About 4.3 S8 charges
  • 4.6 stars, 29,400+ ratings
  • 3-year warranty
  • Flashlight

Cons

  • 12.7 oz
  • 22.5W is slower than the INIU 45W
  • Too big for a pocket

What owners say: Owners trust it for long trips. A few want faster charging.

Buy it if you will be away from a socket for days. Skip it if you want pocket size.

See the INIU 20,000mAh on Amazon →

6. Anker Zolo 20,000mAh 30W Power Bank: fast big bank with built-in cable

The Zolo is a 20,000mAh Anker with 30W output and a built-in USB-C cable. It weighs about 12.5 ounces, holds 4.4 stars from about 14,700 ratings and has an 18-month warranty.

It suits an S8 owner who wants a big bank with no separate cable.

Score: 3.6 out of 5 (portability 3, output 4, warranty 3, owner rating 4.4)

Pros

  • 30W output
  • Built-in USB-C cable
  • About 14,700 ratings
  • About 4.3 S8 charges

Cons

  • 18-month warranty
  • About 12.5 oz
  • Built-in cable cannot be replaced

What owners say: Owners like the speed and the built-in cable. Complaints are about weight.

Buy it if you want a big bank with a built-in cable. Skip it if you want the longest warranty.

See the Anker Zolo 20,000mAh on Amazon →

How many Galaxy S8 charges do you get?

The Samsung Galaxy S8 has a battery of about 3,000mAh. A power bank delivers roughly 65 percent of its rated capacity, so a 10,000mAh bank gives about 2.2 charges and a 20,000mAh bank about 4.3.

Estimated Samsung Galaxy S8 charges from 10,000mAh and 20,000mAh power banks
Bank size S8 charges Weight
10,000mAh about 2.2 7.6 to 8.5 oz
20,000mAh about 4.3 12.5 to 12.7 oz

These are estimates, not lab results. An older S8 battery holds less than a new one, so you may get slightly more charges per bank.

Does a faster power bank charge the S8 faster?

Not always. The S8 supports Samsung Adaptive Fast Charging, which is about 15W. Even a 45W bank will not make it charge faster than the S8 allows. That is why a 15W bank like the Anker PowerIQ is a good match.

Guide to how fast a Samsung Galaxy S8 charges from a power bank

A faster bank is still worth buying if you also charge a tablet or plan to change phones, because the same bank will then charge those quicker.

How to get the best charging from an S8

Five tips to get the best charging from a power bank on a Samsung Galaxy S8

If your S8 battery has aged, you may want a charge sooner than you did when it was new. A power bank in your bag is a simple fix.

How to choose a power bank for the Galaxy S8

1. Make sure it has a USB-C output

The S8 has a USB-C port, so any modern bank with USB-C works. All six here do.

2. Pick the size for your day

10,000mAh is plenty for a day out. 20,000mAh is better for a long weekend or a festival.

3. Do not pay for watts the S8 cannot use

The S8 takes about 15W. A 30W or 45W bank is not faster for the S8, but it is useful if you charge other things.

4. Consider a built-in cable

The Nano and the Zolo have a USB-C cable built in, which suits the S8. You cannot replace it, though.

5. Check the warranty

INIU gives 3 years. Anker gives 18 to 24 months depending on the model.

6. Flying

All six are far under the 100 Wh airline limit. A 20,000mAh bank is about 74 Wh. Keep power banks in hand luggage.

How we score and choose

How we choose power banks: specs, Amazon listing details, owner feedback, portability, output, warranty and ratings

We want the picks to be easy to check. Our picks are based on manufacturer specifications, independent reviews and thousands of customer reviews. We compared specs, tested-by-others results and real owner feedback to choose these six.

How we score

Each score is the average of four numbers out of 5. The rules are the same for every product.

  • Portability by weight: 8 oz or less scores 5, over 8 and up to 9 oz scores 4, and over 9 and up to 13 oz scores 3.
  • Output by watts: 45W scores 5, 30W scores 4, 22.5W scores 3.5, and 15W scores 3.
  • Warranty by length: 36 months scores 4, 24 months scores 3.5, and 18 months scores 3.
  • Owner rating is the star rating shown on Amazon on 21 October 2026.
Product Portability Output Warranty Owner rating Score out of 5
INIU 10,000mAh 45W 4 5 4 4.4 4.4
Anker 10,000mAh 30W 5 4 3 4.5 4.1
Anker Nano 30W 5 4 3.5 4.4 4.2
Anker PowerIQ Slim 4 3 3 4.5 3.6
INIU 20,000mAh 22.5W 3 3.5 4 4.6 3.8
Anker Zolo 20,000mAh 30W 3 4 3 4.4 3.6

Because the S8 can only use about 15W, the output score matters less for this phone than for a newer one. The score is a guide, not the final word.

FAQ

Quick answers to the questions we hear most. Tap a question to open it.

What size power bank is best for the Galaxy S8?
A 10,000mAh bank suits most people and gives about two S8 charges. For trips, choose 20,000mAh, which gives about four.
How many times can a power bank charge a Galaxy S8?
The S8 battery is about 3,000mAh. A 10,000mAh bank gives roughly 2.2 charges and a 20,000mAh bank roughly 4.3, after conversion losses.
Does the Galaxy S8 support fast charging from a power bank?
Yes. The S8 supports Samsung Adaptive Fast Charging, about 15W. Use a power bank with USB-C output and a good cable to get it.
Will a 45W power bank damage my S8?
No. The phone only draws what it can use, so a higher-wattage bank is safe. It simply will not charge the S8 faster.
Can I use any USB-C cable?
Most work, but a short, good-quality cable gives the best speed. A very cheap cable can slow charging.
Can I charge the S8 wirelessly with a power bank?
The S8 supports wireless charging, but the banks in this guide use USB-C cables. Wireless power banks are slower and heavier, so a cable is usually better.

Why you can trust this guide

What we did: we read the specs, warranty terms and owner-review summaries on each Amazon listing on 21 October 2026, and kept only products that met the rules above.

What we did not do: we did not test these products ourselves, and we do not claim to. The scores come from published specs and owner feedback, using the formula above.

How we earn: we are an Amazon Associate, so we earn from qualifying purchases at no extra cost to you. The scoring rules are the same for every product.

About this guide: Power Bank Online Editorial Team

Last updated 21 October 2026. Specs and ratings were read from the Amazon listings on that date. If a spec has changed, tell us and we will correct it.

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Disclosure: as an Amazon Associate we earn from qualifying purchases.

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