After one month of use, the phone does not charge. Both the batteries and the cable are new. Bad defective product. Do not buy it!!!

Very good value for money, and an impressive gadget (I've had it for 6 months). It is both a charger (18650 & 21700 tested, no problem) and a power bank with fast charging (!). Someone mentioned that it supports pass-through charging but I assume it will lower the amps when charging the batteries. It is also extremely lightweight. I didn't find any flaw. It is very handy for electronic cigarette batteries, flashlight (classic 18650), power bank with batteries that you change yourself (especially if you have 4-5 old ones from an electronic cigarette lying around, it is an even better power bank than all those on the market - inexhaustible). A blind buy.

I got it about 10 months ago, I used it daily, I put two batteries to charge every day, and sometimes even twice a day. It lasted 10 months, until it stopped charging my batteries. While it was working fine, it charged them relatively quickly. In the last 15 days before it stopped, it started having issues with the charges until it completely stopped. Good quality construction and the springs inside were good. But it lasted only a little while.

If you want to deal with charging batteries separately very useful... lightweight, its capacity is proportional to each user so it is convenient for people who do not have space in their bag but also for people who have space and want to take advantage of it

Incredible. With a 25w charger, it charges 18650 batteries from 10% to 100% in 1+ hours. Convenient size for carrying in a bag, I don't notice the difference in weight compared to when I have the batteries in their case. I use it to have extra batteries for my mod. Bonus for me that it works as a powerbank!

Ready to order another one!!

Powerbank and charger, I would definitely recommend it and always with good batteries (I have it with 2*xstar and a second set of 2*nitecore 18650 with 3500mAh).
I have had it for 2 years and it has not presented any problems.

Flawless, convenient, the perfect tool. Use its own cable for fast charging or better!

It works well both as a power bank and as a compact charger for batteries. The only thing I don't like is that it smells very strongly of plastic. It's not necessarily a bad thing, but I would definitely prefer something better from xtar.

There is no other power bank where you can put whatever battery you want. It takes from 18650 to 21700. I have put 2x 21700 5,000mAh each, so you have a power bank with 10,000mAh that fits in your pocket.
And when the batteries run out, you put them in an external charger and connect them to the power bank when they are full, and you are ready. No need to wait for it to charge all night or anything. It's the most practical thing.
+fast charge

Flawless device with a nice design and very fast charging. Good build quality and practical size. It is worth every penny!

It works perfectly both as a charger and mainly as a power bank, as with the 2 21700 batteries I have put in it, it manages to charge quickly and bring my phone with a 5500mAh battery to 100%. I can also see the battery percentage of the power bank and the amperes it provides as a fast charger. I have also bought 2 extra 21700 batteries, so I can switch them in seconds and have a fully charged power bank immediately.