Excellent for their price. I bought 4.
1. 3230ma 2. 3320ma 3. 3280ma 4. 3220ma.
Before testing, they did 2 to 3 charging cycles.

Capacity is about the same as specified.

More than double the time compared to the old ones

Very good quality. It was exactly what I expected. I rebuilt a robotic vacuum battery and its autonomy life really doubled.

I put in five (5) and quite easily I would say, even though without tabs (I soldered the existing tabs onto their poles), for the repair of the battery of my rechargeable drill, which really died completely and even during work.
Those were just 1.3 Ah, while these are more than double and I think this will boost the autonomy of the drill, which I immediately charged (initial charge about three (3) hours with its own charger) and then continued my work with much greater intensity.
I can say that I recommend them unreservedly, so far they do what they promise!

Nominal capacity 3400 mAh, actual from tester 3458. Replaced batteries for Black & Decker 18 V vacuum cleaner, which originally had 2500 mAh batteries from the factory. The vacuum cleaner lasts noticeably longer than when it was purchased.

Because I read comments that show a lack of research regarding the purchase of this battery, at least watch the following video to understand the capabilities of this and other batteries that may be more suitable depending on the use.
Roughly, however, the 35E is suitable up to 8A,
the 30Q up to 15A and the 25R up to 20A. https://www.youtube.com/watch?v=qMZuHMlRw_0&t=637s

So far so good. I have had them for three months in a Black&Decker vacuum and it works longer than it did with its original batteries. Time will tell, but so far everything is fine.

Satisfactory quality but it is less than 3500mAh.
NOT SUITABLE FOR VAPE.
For their price, they are just right for replacing batteries in an old power bank.

I happened to see now while looking for batteries that it is mentioned in reviews that this battery is not for use in electronic cigarettes and I got scared because I have bought this specific one from a store with electronic cigarette products and have been using it in my cigarette for over a year. Indeed, it also says in the description that it is not suitable, but as I understood, I didn't have a problem because I vape at 10w and without knowing it, this protected me from worse outcomes.

It says on the battery that it is not for Vape, I don't know if it's the store's fault or this battery in general, but it is not mentioned anywhere in the description that it is not for electronic cigarette.

in a flashlight they work just fine and last... I have a flashlight that I don't use much and yet with one charge they have lasted a year

At first I was worried because the battery does not say Samsung on it, but then I confirmed that it is. During charging, the charger showed 3300 mAh, so it means that its capacity is large

I replaced them in solar lanterns that had 2000 mAh and I saw a difference but not a big one... At most, they last maybe two hours longer. Of course, it could also be that the solar collector cannot charge that many mAH.

I received it at 3.5 Volts. Until fully charged, it took 2300 mAh.
At 3.5 it did not light up the flashlight I put it in.
So from the 3500 you should expect around 2300 performance until the battery drops from 4.2 to 3.5 Volts.
The internal resistance was 33 mOhm and the weight at 47g, as stated by the manufacturer.

It seems to be good quality

I replaced the cheap Chinese battery of a flashlight with this branded one and the duration doubled.

I wish they said that they are not intended for electronic cigarettes, rather than finding out when you have it in front of you

It keeps a spotlight on the strong setting for about 6 hours.. while the main battery of 2500mAh lasted about 3 hours..

They write to me do not use for vape, while there are many who say they use them for vaping mods. After just 2 months, they have decreased quite a bit in duration.

i used them for vaping for half a year nothing happened to them and i just realised they say FIRE HAZARD!NOT FOR VAPE NEVER INSTALL,CARRY OR HANDLE! but i used it for half a year now so i dont think somethink will happen use at your own risk tho

Very good batteries. Reliable with endurance. They charge up to 4.3-4.4v depending on the piece, but this is what I achieved with all 6 that I tested

Classic Samsung quality, the first year is like the first day. The second year starts to decline but not enough to want a change. It is used in an electronic cigarette. Recommended 100%. No Samsung has oxidized on me, the most important reason I choose it again.

I bought 4 because my old ones had dropped significantly in performance. I've had them for a year and a half. At first, they had exactly the same performance as the older ones (I had the green ones, used for 4 years). From new until today, their performance has been declining more and more. I would say that now from 100% to 80% they have better performance, but from 75% to 0% they are like useless and the performance drops sharply to 80%. I measured them today and they show 3.7V. Used for electronic cigarette. Charging ALWAYS with a special charger with slow charging. Unfortunately, with batteries, you NEVER know what you're getting.

That's it, 3/5.

One year later, the batteries go up to about 2670 mAh. Maybe even the four stars are too many.

I'm very glad that I didn't fall victim to fake batteries since I have an external charger; I measured them and they are around 3450 to 3540 mAh, they are very good

Perfect for the headlamp. It lasts longer than the battery that came with the lamp, which claims to be 3000mAH. I wanted to have a second battery for backup, so now I'm using this one and keeping the original battery as a backup. Even after so many months of daily use of the headlamp, I've only needed the backup once or twice because it lasts a long time, and I can even use it for a second day. But if it doesn't last, I have the backup.