A decent charger but slow. Even if you connect it with a quickcharger it will charge at 1000mah even for a 21700. Alternatively, you have to manually set it to 1500 each time, which is still slow for just one battery. It should automatically charge a 21700 at 2000mah and two at 1000. Generally, Nitecore quality is a constant value, I have chargers from 2014 that are like new.

I've changed three so far because I couldn't believe they were of such poor quality, I kept thinking it was just bad luck every time one broke... The first one lasted a few months and then just wouldn't turn on again at some point, the second lasted a year and again the same thing, and the third, which broke now in less than a year, just one morning the screen backlight turns on without showing anything... That's it for me with this charger and in general I've lost all trust I had in Nitecore...

After 10 years of daily use, the Nitecore D4 broke down.
Looking for a new charger, I only considered Nitecore.
That's how I ended up with this one!
A pleasant surprise that it has a USB type C connection and not micro USB!
It also has a very low price!

The products of NiteCore are all very good. This particular charger, despite the disadvantage that it connects with MicroUSB, is amazing!

It's good...a bit of a confusing menu... Because I read comments that it breaks down...I want to see how it performs over time

Quite a bit of use. Very good. With a small solar panel, it charges batteries. Chinese, but why not? Good quality and impressive indicators and functionality. Yes, I recommend it.

Easy to use and set up with 2 buttons, it recognizes the batteries you insert, you can adjust the charging speed according to your needs. I hope it lasts, if it breaks I will come back. So far, everything is good

very good machine. charges smoothly without fear. The indicators are correct and useful. I don't give 5 because you have to connect it exclusively with USB and not with a charger. Good for some bad for others. Honest purchase

If I could, I would give it 0 stars. It takes way too long to charge. The controls for changing the charging level are very inconvenient. After about a month, it's trash.

Very good build quality, easy to use, and very good information on the screen. It does exactly what it says. I hope it is equally reliable in terms of durability over time. *It also came with a paper and the manual in Greek + one for that! So definitely one more reason to recommend it!

Quality construction (day and night compared to a four-slot XTAR), plenty of indicators, charges my lithium 18650 batteries quickly and safely for my electronic cigarette. It can also charge regular rechargeable batteries

All chargers from this company are among the best, if not the best. Excellent charger!

I don't know if it's fast, as I read. It takes 3.5-4 hours to charge a 18650 battery. However, there is something else. If I put a battery only in Slot 1, the charging percentage bar is permanently at Zero. If I move it to Slot 2, the bar appears. When I have two batteries simultaneously, there is no such problem, but with only one battery in Slot 1, there is an objective problem.

Never again. The first one purchased lasted 6 months. A partial refund was given by Nitecore and another one was sent. Today, 15 months later, the second one broke.
They turned out to be luxury trash. I will try my luck with Xstar.

Update: the charging port came off (it was held by glue from the inside). Too bad I got XTAR.
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Initial rating:
Very good and sturdy construction, very good display you can easily understand the indications, smart operation per battery (how fast it charges, how much it has charged, etc.). It supports almost every rechargeable battery. It also has easy handling with the buttons.

The charger is great - it does what it says in its specs for 18600 and 21700

Excellent charger.
It supports multiple types and sizes of batteries.
Automatically recognizes the battery type and indicates the amount of Amperes given during charging and the battery's condition, both during and at the end of the charging process.
Fast charge function with 18w.
It also has the ability to manually adjust the charging up to 1500mAh in each slot!

Far and beloved children...
Within two and a half months of use, it burned out on me...
And I had bought it brand new...