Anker Nano 5,000mAh Review: Best Pocket Battery for iPhone?

Quick Verdict

The Anker Nano 5,000mAh is a power bank you can keep in a pocket and forget about until you need it. Its capacity won't fully charge an iPhone 16 Pro Max from dead to 100%, but it will rescue you from the dreaded 5% battery warning and get you through the rest of your night.

If you hate carrying tangled cables, this is the solution. Get the Anker Nano 5,000mAh on Amazon^*. For under $30, the built-in USB-C connector alone makes it worth the price of admission.

The Built-In Connector Changes Everything

The biggest friction point with traditional power banks isn't the weight - it's the cable. If you forget your cable, the brick is useless.

The Anker Nano (View on Amazon)^* solves this with a brilliant folding USB-C connector. You flip it out, plug the entire unit directly into the bottom of your iPhone 15/16 or Android, and charging starts instantly. When you're done, the connector folds flush into the body so it won't snap off in your pocket or bag.

Charging Speed and Real-World Capacity

Anker rates this at 22.5W output, which is fast-charging speed for a smartphone. Apple says an iPhone 15 Pro reaches about 50% in around 30 minutes on a 20W or faster charger, and the Nano's 22.5W output meets that bar.

Here is the honest math on the 5,000mAh capacity: because of voltage conversion and heat dissipation, you get about one full charge for a standard smartphone (or about 80% for massive "Ultra" or "Pro Max" models).

This is not a multi-day camping battery. This is a "got stuck at the airport" or "taking photos all day at a festival" battery.

Portability: It Actually Fits in Your Pocket

Most "compact" chargers are still heavy bricks. The Anker Nano is barely larger than a standard lipstick tube (3.0 x 1.4 x 1.0 inches) and weighs just 3.5 ounces (100g). You can leave it plugged into the bottom of your phone and comfortably continue texting or making calls.

It has a single USB-C port used for both input and output. You charge the bank first, then use it to charge your phone. It does not support passthrough charging, so you cannot charge the bank and your phone at the same time.

Limitations to Know Before Buying

• Capacity Limit: Again, this is one charge. If you need to charge an iPad or power a laptop, this won't cut it.
• Gets Warm: Pushing 22.5W out of a tiny chassis means it can get warm during peak charging. This is normal lithium-ion behavior, but worth noting.
• Thick Cases: If you have an extreme, Otterbox-style thick case, the folding connector might not reach deep enough to click in securely.

Alternatives to Consider

• Anker 622 MagGo: If you prefer magnetic wireless charging over a physical plug, the MagGo snaps to the back of your phone. However, wireless charging is significantly slower than the Nano's direct 22.5W connection.
• Baseus 10,000mAh Slim: If 5,000mAh isn't enough, this doubles the capacity while remaining surprisingly flat. You lose the built-in connector, though, and have to bring a cable.

If you are putting together a travel kit, our packing cubes review and Osprey Daylite 26 review cover other essentials we have reviewed.

Final Recommendation

The Anker Nano 5,000mAh^* does exactly what it promises. Flip the connector out, plug it in, and your phone starts charging. No cables to dig for, no adapters to forget at home. The 22.5W output fills your phone fast enough to actually matter when you are in a rush.

If you regularly find yourself staring at a terrifying 10% battery warning with several hours left in your day, toss this in your everyday carry bag and forget about it. Lost in a new city, filming too many concert clips, stuck on a delayed train -- you just pull it out, plug in, and keep going.

At 3.5 ounces, there is basically no reason not to carry it daily. This thing just works, and for under $30 it pays for itself the first time it saves your phone from dying at the worst possible moment.

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About the Reviewer: Maria Weber

Maria Weber reviews every product on this page before it is published. We review the products ourselves, and we own most of the products we review. We do not run our own lab tests. Read more about our editorial guidelines and how we verify deals.