Can the Anker 10,000mAh Slim Power Bank Really Charge a Phone, Tablet and Chromebook?

I recently picked up three Anker 10K Slim USB-C power banks. At the time of writing, I paid around £12 / $15 each — but prices change all the time, so it’s best to check the latest price on Amazon below.

Crucially, the Anker 10K Slim with USB-C PD has a maximum output of 18W. That’s why it can charge modern phones and tablets at full speed, but only delivers a slow “maintenance charge” to Chromebooks (which usually require 45W+ for fast charging).

The Test Setup

Each Anker 10K Slim was connected via its USB-C port to one device. All three were charging simultaneously. No hubs, no adapters — just straight USB-C cables.

(Insert photo here: all three power banks powering the phone, tablet and Chromebook together)

Real-World Charging Results

• Galaxy S23 Ultra – Charged at full USB-C PD speed. Even with the screen on, the battery still went up.

  
  

• Acer Chromebook 314 – Yes, it will charge, though slowly. It’s enough to keep you going through a lecture, train ride, or library session.

  
  

• Galaxy Tab S9 Ultra – Charged reliably. Battery percentage increased during light use (streaming, browsing).

What Makes the Anker 10K Slim Useful

• 18W USB-C PD output – fast charging for most phones & tablets

• Slim & pocketable – slides easily into a bag or pocket

• USB-C input/output – no more micro-USB hassle

• Trusted Anker reliability – solid build and long lifespan

• Light but versatile – handles phones, tablets, and even Chromebooks in a pinch

Who It’s For

• Phone users: A reliable backup for a full day with power-hungry phones like the S23 Ultra.

• Students/commuters: Slim enough for daily carry, will keep a Chromebook or iPad alive.

• Tablet owners: Enough juice to meaningfully top up even the biggest tablets.

Who It’s Not For

• Laptop professionals: If you need fast charging for a MacBook, gaming laptop, or high-power Chromebook, you’ll want a 45W–65W+ power bank instead. The 10K Slim just isn’t built for that.

FAQs – Questions People Ask About the Anker 10K Slim

Can the Anker 10,000mAh Slim charge a Chromebook? Yes — but slowly. Its maximum 18W output is enough for light use, but it won’t keep up with heavy workloads.

How many full charges can it give a Galaxy S23 Ultra? About 1.5 charges from 0–100%, depending on brightness and use while charging.

Why is the actual usable capacity less than 10,000mAh? All power banks lose some energy in conversion. Expect around 5,500–6,500mAh delivered — standard for this size.

How long does the Anker 10K Slim take to recharge? With an 18W PD wall charger: ~3.5–4 hours. With a basic 5V/2A charger: 6–8 hours.

Can it charge two devices at once? Yes — one via USB-C and one via USB-A. But the output is split, so neither charges at full speed.

Does the Anker 10K Slim support pass-through charging? No. You need to recharge the bank first, then charge your devices.

Does it support fast charging? Yes, for phones and tablets. It supports 18W USB-C PD, which is much faster than a 5W pack.

Can it charge AirPods or smartwatches? Yes. It has a trickle-charging mode (activated by double-pressing the power button) that safely powers low-capacity devices.

Do all USB-C power banks charge devices via USB-C? No. Some power banks only use the USB-C port for input (charging the power bank itself). The Anker 10K Slim has models where the USB-C supports both input and output — make sure you choose the USB-C in/out version if you want to charge your phone or tablet directly from USB-C.

Is it good for travel? Definitely. At 10,000mAh it’s well under airline limits, and its slim design makes it easy to pack.

Final Thoughts

The Anker 10K Slim won’t replace a laptop charger, but as a slim everyday backup that works with phones, tablets, and even Chromebooks in a pinch, it’s excellent.

👉 Buy on Amazon

Affiliate Disclaimer: As an Amazon Associate, I earn from qualifying purchases.