iPhone 17 Portable Charger, Nano Power Bank with Built-in USB C Connector, 5,000mAh Portable Charger 22.5W, for iPhone 17/16/15 Series, Samsung S22/23 Series, iPad Pro/Air, AirPods, and More

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.

Small, lightweight, and easy to use. The built-in connector is very convenient, and it charges my phone reliably. Great quality as expected from Anker. Perfect for everyday use.

I’ve been using this portable charger for a little while now, and it has become something I always keep with me. It’s lightweight, compact, and fits easily in my bag without taking up much space. The charging speed is impressive — it boosts my phone quickly, even when I’m on the go. The battery capacity is also solid. I can get multiple charges out of it before needing to plug it back in, which is great for long days or travel. The display/indicator makes it easy to see how much power is left. Overall, it’s a reliable and convenient charger that does exactly what you need it to. Definitely worth the purchase if you want something dependable for everyday use or trips.

Updated : This review is for Anker Portable Charger Model # A1653 Outcome: Good charger but clunky. Perfect for carrying where space is issue. Fast charging test on iPhone 16 - Test1 : 10% to 60% in 35 min ( charger was half down to 2 dots ) Test2 : 20% to 70% in 40min ( charger was half down ) Gets warm not hot but that was expected. I do see charger is slow in charging itself. I felt connection to phone is not snug tight but its ok as i didnot see any issue with charging my iPhone. Does not lay flat as others have complained due to its thickness which is double size of phone so connecters wouldn’t align, turn it other side for charging if your like. if you r carrying in a bag it will not matter. Its a keeper for me like the folding connector its nice.

This power bank much like the wall chargers can conceal its c-plug in order to prevent it from being damaged. Its a slow charge but an even faster charger and last for a long time. It took my phone from 15% to 30% in a jiffy. Its also worth the value for your money. Its sleek slim design is honestly unique to this brand alone. This power bank puts the power first. It is also travel friendly for those who take the plane a lot. All in all its worth it I give it a 10/10 and highly recommend.

Charges fast and well. Can't say it fills up my Pixel 8 Pro more than 50%. Size factor is great, very convenient. However, the little flip out connector is flimsy and fragile. I dropped the phone once and the connector broke and is now dangling.

Nice, small, portable charger. I use it for a Samsung Galaxy FE25 and it works well. Good for when you need a quick charge.

This Anker Nano Power Bank has been excellent for fast-charging my smartphone, much faster than any of my other phone chargers, and of course, very handy since a cable is not needed. My only disappointment has been with an "off-label" function that has changed. I bought my first Anker Power Bank in December 2023 after reading a review that its functionality included a 25-30 minute stand-by period, much longer than cheaper power banks that usually had a 30-second stand-by period. In other words, if the power bank was being used to power something intermittently - like a card shuffler being used every 10-15 minutes - it would remain active and the On button would not need to be pressed each time before use. Unfortunately, I lost my first power bank on vacation and purchased a replacement in June 2025. The replacement was still an excellent phone charger, but it had lost the ability to remain on stand-by for 25+ minutes, and only offered a brief stand-by period of 20-30 seconds, the same as the cheaper power banks. I contacted Anker and they said that there was probably a firmware or hardware change that had been made between December 2023 and June 2025, in the interest of minimizing even any tiny extra drain during stand-by. So ... still a great phone charger, but without the extra functionality that was useful for certain other USB-C powered things.

Very handy for charging on the go. Fast

Nog maar 1x gebruikt, ging prima, het opladen ook, ik ben er blij mee,

These are great, especially in bed or just in general when you want to use your phone when its charging and you dont want the inconvenience of wires pulling. Charges your phone quickly.

Bardzo dobry powerbank.

En tant qu’utilisatrice fréquente de mon téléphone, la fonction de charge rapide de la Powerbank Anker Nano m'est essentielle. Elle recharge mon téléphone de manière rapide et efficace, ce qui est crucial surtout lorsque je suis en déplacement ou en voyage et que mon téléphone est presque déchargé. 🔹 Design compact et élégant Le design compact et léger de cette batterie externe m'a vraiment impressionnée. Elle se glisse aisément dans ma poche ou dans mon sac à main sans prendre beaucoup de place. Que ce soit pour des voyages longue distance ou pour mes trajets quotidiens, elle est devenue mon compagnon idéal. J'ai opté pour le blanc, dont la couleur élégante s'harmonise avec tout et offre une belle finition. 🔹 Connecteur USB-C pliable intégré Ce que j'apprécie particulièrement dans cette batterie externe, c'est son connecteur USB-C pliable intégré. Cette fonctionnalité facilite grandement le rangement et m'évite de me soucier des câbles qui s'emmêlent ou s'usent prématurément. L'utilisation est ainsi plus sûre et plus pratique, sans nécessiter de câble supplémentaire. 🔹 Polyvalence et compatibilité étendue La polyvalence de la Powerbank Anker Nano est également impressionnante. Elle est devenue un accessoire indispensable pour mes besoins de recharge quotidiens. Je l'utilise principalement pour charger mon Samsung Galaxy Z Flip 5. En raison de sa taille et de sa forme, je recommande surtout de l'utiliser pour charger des téléphones plutôt que des tablettes, car elle est parfaitement adaptée à cette utilisation. 🔹 Fiabilité et durabilité Utilisatrice de longue date des produits Anker, je fais entièrement confiance à la fiabilité et à la durabilité de leurs produits. La Powerbank Anker Nano ne fait pas exception. Je suis convaincue qu’elle recharge mes appareils en toute sécurité, sans risque de surcharge ou de court-circuit. 🌟 En conclusion, la Powerbank Anker Nano répond parfaitement à tous mes besoins en matière de solution de charge portable. Avec sa charge rapide, son design compact, son connecteur USB-C pratique, sa polyvalence et sa grande fiabilité, je la recommande vivement à tous ceux qui recherchent une solution de charge portable efficace et fiable.