Nano Power Bank,5,000mAh Portable Charger, Built-in USB-C Connector | 5,000mAh 22.5W Portable Charger for iPhone 17 / 16 / 15 Series, Galaxy S23 / S22 Series, iPad Pro / Air, AirPods, and More

I’ve got larger power banks (in all senses of the word), but this is the one I reach for when I’m going to be out for a long day using my phone intensively, and I want to make sure my battery doesn’t get too low. It’s small and lightweight, and it’s easy to hold when I’m holding my phone. I get a little less than a full charge from it, but that’s plenty to keep me in the safe zone. It also provides a surprisingly fast charge, so it’s easy to top off my phone quickly. I tried a MagSafe charger from another brand, but it was bulkier, slower, heavier, and more awkward to hold even though it clung to the back of my phone. I choose this one every time.

I see a bunch of one-star reviews, mostly from people who seem confused about battery capacity, energy, power, voltage, current, etc. People complain that this little pocket-size battery won’t fully charge their iPad. That’s like buying a little one-gallon gasoline can for emergencies, and then complaining that it when you poured it into your truck’s empty gasoline tank it didn’t fill the tank all the way to the top. The cell inside the Anker Nano Power Bank is advertised as having a capacity of 5000 mAh. That means the cell can (for example) supply 5 A for one hour, or 2.5 A for two hours, or 1 A for five hours. Battery engineers like talking about mAh because it is useful for their circuit designs, but for the rest of us it’s not very useful, because knowing the energy in 5000 mAh depends on knowing what voltage we are talking about. For end users, it is more useful to compare batteries based on the energy they store rather than the amount of current they use to deliver that energy. So that means talking about watt-hours (Wh) instead of mAh. For this battery the cell voltage is about 3.6 V, so 5000 mAh gives you 18 Wh. But phones aren’t designed to take power at 3.6 V. Phones require 5 V (or higher). Voltage conversion circuitry is not perfectly efficient. The text on the battery itself claims, “2600 mAh @ 5V x 2.4 A,” which means it can deliver 2.6 x 5 = 13 Wh of energy. This means that the voltage conversion circuitry inside the Anker Nano is about 72% efficient, so the 18 Wh at 3.6 V becomes 13 Wh at 5V (28% of the energy is wasted as heat). In practice, measuring a couple of Anker Nano Power Banks using a USB energy meter, I found they actually deliver 12 Wh (2.4 A @ 5V for one hour). 12 Wh is close to the 13 Wh that Anker claims, but not quite. My iPhone 15 Pro Max has a battery capacity of 17.32 Wh. Charging a battery is also not perfectly efficient — charging makes your phone get warm, and that heat is more wasted energy. If we assume that battery charging is also 72% efficient, then the 12 Wh from the Anker Nano becomes 8.64 Wh in the phone battery, or about half of the my iPhone 15 Pro Max battery capacity. In my experience the Anker Nano does indeed charge my phone from empty to around 50%. Because the Anker Nano supports USB C voltage negotiation, phones that support higher voltages can request up to 10V, allowing the Anker Nano supply up to 22 W for faster charging than a normal USB 5 V supply. The Anker Nano Power Bank is great for unplanned situations where you unexpectedly find your phone battery is drained. The Anker Nano is a small battery that easily fits in a pocket or a bag, and you don’t need to remember to carry a cable with it, because the built-in USB C plug connects directly to the device being charged. If you prefer to use a cable, it also has a USB C socket for that. Last year at the end of a day of skiing I found myself trapped for two hours in a broken-down gondola with four other people. All of their phone batteries were drained, and they were concerned about how they could tell their friends where they were. I pulled the little Anker Nano out of my pocket and passed it around. Within a few minutes everyone had charged their phone 10-15%, enough to call their friends and let them know what was happening.

I'm impressed. I have a 10-year-old Samsung Galaxy S8 (no shame) it works great and this helps keep it charged. It's slightly larger than the last one I had, but the point of connection seems much stronger (won't fall off easily). It drains it's power pretty fast, one full charge = 1 phone recharge but that's okay.

A good portable charger solution, the quality I've come to expect from Anker charging products over the past few years which is solid. USB C connection will fit snug right into your phone, but if you have a really thick case on your phone this may cause some tension. Downside is the battery does work, and seems to be able to quick charged, but if your phone is running near E don't expect to get more than 1 full charge + out of this charger, meaning maybe a solid 1 and half charges before you have to recharge itself, but the bonus is the portability which allows you to charge your phone or tablet easily while still streaming or not having it plugged in a nearby outlet. Build quality: Seems solid, USB C port is a foldout to charge, but seems well made, may weaken over time or extended use. Also has a USB in/out port on the side for charger the device or plugging it into your phone or tablet that way (which kinda defeats the portable factor, but is a good backup method if the foldout port stops working). Weight: Doesn't weigh that much, but will add some weight to your phone if you are carrying it handheld, if you have your device mounted on let's a tablet or phone stand should be not be issue at all. Portable capacity: Charging capacity is the only reason for a deduction in a star, it is good but not great, good to use in a pinch, or if you are streaming a movie or show and don't have a nearby outlet for some reason, or maybe possibly to do extended recording if you don't use your phone USB port for something else like storage/mic/etc.

I've used the similar Anker 5,000 mAh power bank (portable battery charger) that has the lightning connector for my iPhone 13, but my newer iPhone 17 has a USB-C port for charging. Therefore I ordered this USB-C power bank. Other than the connector type they seem the same. I like them because the are small and need no cord for attaching to your phone or other device. (They do use a cord when recharging the power bank itself through the port on the side.) The USB-C port on the side can also charge a device through a cord; it is an In/Out C-port. It can therefore charge devices that don't have a C-port as long as your cord has a C-connector on one end and your device's connector type on the other end. At 5,000 mAh this will provide about one full phone charge or top off a few devices. The smaller power capacity allows it to be more compact and lighter. This one charges devices fast and recharges fast, by my standards. Airlines allow power banks of up to 20,000 mAh so this one is well within TSA allowed limits. All power banks must go in carry-on bags, never in checked luggage because of the fire hazard of all lithium-ion batteries. I considered the thin, flat magnetic Anker power bank that sticks to the back of the phone, but decided on this one instead because this one is faster and can also be used to charge my earbuds, Kindle, and Fire tablets. Anker is a brand that is generally trusted for this type of device. A note on the blue colors... My old lightning-connector power bank was a very light aqua-tinted or sky blue, but this one is a truer blue and a little deeper color. Both are pretty colors for my blue iPhones.

Compact and convenient!! Compact size makes it easy to carry. Built in plug that folds into the device can be used to directly recharge the device or charge your other device. Also included is a charging cord. Real winner!!

For some reason it randomly stops charging when using the flip-up connector. The side port works fine though. This is true for both of the two I bought.

A nice pocket size to carry around and easy of use. Great for emergency or just quick need charge with out cable or needing wireless charge. I play few games on my phone, listening to music, and run an app with GPS so when my phone reach close to 50% I charge up. It is a one time use for my phone, Samsung Ultra 25 and then I need to charge the portable charger. I do have a car charger and use it while in the car but being at work with limited number of outlet near me I prefer to have this plug in to my phone. As I said it easy to use no need for cable or to wireless charge, a nice pocket size charger to carry. Lastly remember to use a correct voltage or watts for input to charge up the charger, max is 18 watts.

Batería pequeña, puedes llevarla en el bolsillo y para lo que quería que es para un apuro te carga el móvil perfectamente. Además es bastante rápida la carga y no necesitas cable

Very handy for charging on the go. Fast

Ich habe die Anker Nano Powerbank im November 2025 gekauft und schreibe diese Rezension bewusst erst jetzt, nach gut 6 Monaten intensiver Nutzung. Ich bin der Meinung, dass Rezensionen, die direkt nach dem Auspacken verfasst werden, kaum Aussagekraft haben. Erst der Alltagstest zeigt, was ein Akku wirklich taugt. Hier ist mein ehrliches Fazit nach einem halben Jahr: Das hat mich überzeugt: Der faltbare USB-C-Stecker ist top. Man braucht kein extra Kabel und der Klappmechanismus hält auch nach 6 Monaten noch fest und leiert nicht aus. Die Powerbank ist extrem klein und leicht. Sie verschwindet problemlos in der Hosentasche oder Handtasche und fällt kaum ins Gewicht. Ladegeschwindigkeit: Mit den 22.5W lädt sie mein Smartphone (und sogar das iPad) angenehm flott auf. Für den schnellen Energieschub zwischendurch ideal. Das sollte man vor dem Kauf wissen: Die Kapazität (5000mAh): Man muss sich bewusst sein, was 5000mAh bedeuten. Durch den natürlichen Energieverlust beim Laden reicht eine Ladung im Alltag aus, um ein modernes Smartphone 1-mal vollzuladen. Als "Lebensretter" für den Notfall perfekt, aber für ein langes Wochenende ohne Steckdose ist sie zu klein. Passform mit Hülle: Wenn man eine sehr dicke oder extrem robuste Schutzhülle (z. B. Outdoor-Cases) am Handy hat, kann es sein, dass der Stecker nicht tief genug reingeht. Bei normalen, dünneren Hüllen klappt es aber problemlos. Fazit nach 6 Monaten: Die Powerbank hält qualitativ, was Anker verspricht. Die Leistung hat nach dem halben Jahr nicht nachgelassen. Wer eine ultrakompakte Notfall-Powerbank ohne Kabelsalat sucht, macht hier absolut nichts falsch.

Działa świetnie, jest bardzo lekki i mały jak na powerbank. Szybko ładuje i bez problemu można korzystać z telefonu, gdy jest podłączony. Polecam!"

Very happy with my Nano power bank, it’s small and you can take it every where with you