Anker Power Bank(PowerCore 10K),Compact Travel-Ready 10,000mAh Battery Pack with PowerIQ Charging Technology,5V/3A High-Speed Charging for iPhone,iPad,and More (USB-C Input and Output（Black），1pack)

Surprisingly good.
This holds a charge for many months and charges my iPhone fairly quickly. Not as fast as a wall plug, but pretty good. What I like best, is how long it holds a charge. It always charges my phone when I need it.

What a lifesaver!
I bought this thing a little while ago now and hadn’t yet run into a moment where I had to use it, but I’m thankful to have bought it when I finally needed it. It takes a while to charge the first time, but it holds that charge for a long time. It’s super portable and makes it easy to just put it in your purse or bag plugged into your phone and forget about it. A little heavy and roughly the size of my phone (Galaxy Note 9 for reference). It feels solidly constructed. It doesn’t support fast charging, but it’s not slow either. I highly recommend this, especially for people with older phones, students, and travelers. Even if that isn’t you, it’s great in case of an emergency or power outage because of how long it stays charged.

Questionable Quality Control before shipping but Great Customer Service by Anker!
I’m updating my original review (with 3 Stars). After writing the review, I contacted Anker Customer Service to explain the situation. Erin, CSR, who took the call, asked a few questions assessed the situation, and asked me for the SL No. of the Power Bank, and within a couple of hours or so, she placed an order for a new Power Bank shipped to me which arrived the very next day. This time around, the package had everything including a USB cable, a USB C to C cable at that! Thank you Erin! I have changed my rating from 3 Stars to 5 Stars for the superb Customer Service!
Original Review:
Received brand new Anker Powercore Slim 1000 just yesterday. It is supposed to come with a Charging Cable, Welcome Kit, 18 month Warranty Certificate, and “friendly customer service “.
All I found inside the box was the Power Bank and a safety information booklet. No Welcome letter, no instructions, no warranty information, and no USB cable.
I’m sure when I call them tomorrow, they will tell me they’re sorry for the inconvenience, and will ship me a useless Micro USB Cable which no one uses anymore.
As regards Charging the Power Bank, it came with just 2 lights on (indicator lights). No percentage of charge information.
Anyway, I charged it using a USB C Charger-AC Plug-in, with a USB C to USB C Cable. Supposed to fast charge in this configuration. It took more than 4 hours for the remaining 3 lights to light up and steady (full charge).
Overall, Very disappointing. Charger looks sturdy but a bit on the heavier side and I can hardly call it slim. I wouldn’t be able to put in my pocket and forget it. It does noticeably sag the pocket.
Overall, at the first glance and use, it has been disappointing. Considering it is the first day of use, so generously giving it the benefit of the doubt, I could only give it 3 Stars.

Everything about this power bank is really good! We were going camping and I needed something to charge my phone, so I bought this to have some kind of power and its been really good!
There is a button to check the charge, which makes it useful to see how much is left, good sized battery, super light weight!
The only problem with this is that you need a regular USB for the output, etc. Would have been nice if it also came with a USB-C output since a lot more cables are now USB-C to USB-C now.
But other than that this power bank is really good! Definitely recommend!
(Update, July 7th 2024)
I got a new job which is construction, and I had bought a new Bluetooth speaker to listen to music while at work, so I decided to dig out the battery pack to use while out and let me tell you, this battery pack is insane, I had not used it since we went camping and it held its charge for almost a whole year, and then lasted almost 3 and a half days of on and off charging with my speaker, insanely good battery pack, and I bought it used too, honestly, this might be the best battery pack ever!

Je sais même plus quand je l’ai acheté.. deux ans..? Ptetre 3 , je sais plus. Bah elle tiens encore la charge comme d’habitude.. je m’en sert 2 ou 3 fois par mois. Elle recharge sans problème mon s22 ultra

The Anker Power Bank 10000mAh has proven to be a reliable companion for my daily charging needs. Its slim and lightweight design makes it incredibly portable, effortlessly slipping into my pocket or bag without adding unnecessary bulk. The sleek aesthetic is a bonus, giving it a modern and premium feel.
The 10,000mAh battery size ensures that I have ample power to keep my devices charged throughout the day, and at this price point, it’s excellent value for money. The convenience factor cannot be overstated, making it a go-to solution for those who are always on the move.
While it doesn’t support fast charging, the PowerIQ and VoltageBoost technologies deliver a reasonably swift and efficient charge. It’s a small trade-off for the affordability and portability it offers. The absence of multiple outputs and additional features like a flashlight may be a drawback for some, but for me, the core functionality is what matters most.
Despite its limitations, the Anker Power Bank 10000mAh stands out for its reliability, solid build, and overall performance. It may lack some bells and whistles, but for those seeking a straightforward, dependable power solution, this Anker model is a commendable choice. It has certainly earned its place in my tech arsenal, providing a convenient and efficient charging solution on the go.
If you have a slightly bigger budget id recommend the 20kmAh Anker portable charger as it can charge multiple devices at has fast charge capabilities. Working in tech it does hold more benefits for myself, however for the average joe I highly recommend this product.