Reviews by our members

• 3

  silver_22

  2024-08-15

  Verified purchase

  It doesn't take the batteries to 100%! It takes them to 90% - 95% and you have to charge it 1 to 2 more times to get them to 100%

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• 4

  1 out of 1 members found this review helpful

  service1967

  2023-12-30

  Verified purchase

  This review is about the charging ports: 4

  It looks good and sturdy. All batteries, even the larger 21700 ones, fit in all positions. Easy handling with the two buttons it has, but I don't like that the screen seems to be pressed when pressing it, and for this reason, I give it four stars. The durability will be shown over time. It provides very good information on the screen, but it doesn't inspire absolute confidence in its durability over time.

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• 3

  3 out of 5 members found this review helpful

  korinthios61100

  2023-04-12
  This review is about the charging ports: 4

  I have had it since April 2020 and it works frequently. Every four to five days, I charge 18650 batteries sometimes, and every six days, whether it's fast charging, slow charging, or faster, depending on the adapter you have, that is, the current the adapter provides. The UMS4 charger has had a few glitches like not reading the battery correctly and some silly errors that occasionally appear, but despite that, it doesn't hesitate, you just take out and put back the batteries or the battery that it didn't read, and it starts charging. Don't be scared of these errors, they happen very rarely and it may take some time for it to happen again, just make sure to monitor the batteries for a few seconds when you put them in for charging, in case it gets stuck and doesn't read a battery, and after hours, you realize that the batteries or the battery didn't charge. Anyway, whenever you use battery power, you have to be present because you never know. For example, after a few years of use, last December 22nd, one of the two coffee 18650 LG batteries reached such a high temperature in the charger that it almost exploded (possibly) because the battery was burning excessively, and I wonder how it didn't burst. Luckily, I checked the charger. I took both batteries out and took them to recycling and immediately bought a new pair, and everything is fine. They lasted for 4 years of use, so they held up well. The charger also has a fast mode, but you have to activate it by entering the menu, and it is mentioned in the user manual how to do it. In conclusion, since April 2020, it works on average every five days or every four days, and recently every two to three days because I use an electronic cigarette with a 0.14-ohm resistance, and the batteries easily drain, so I have to charge them more frequently these days. I also charge batteries for a Nitecore flashlight. Buy it without fear. And kids, BE CAREFUL when charging batteries of any chemistry and charging speed, the charger should be near us, we must monitor it for any dangerous increase in battery temperature (especially in summer), but frequent monitoring during charging is still necessary. Also, when you are away from home, do not leave any charger to charge any batteries because you never know. It's better to disconnect the charger from the power, remove the batteries from the charger, and when you return home, put the batteries back into the power for charging and continue. In January 2024, the mini USB connector detached from the charger's circuit board. It is the female connector behind the charger, and initially, I had to adjust it to fit properly so that it could charge. On January 18th, 2024, I unscrewed it to see if I could fix the connector with solder, but it didn't work. I got frustrated, and I will buy another one with a type C connector this time, and it will still be Nitecore. If it breaks again in the future, I will buy a charger from another brand.

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• 5

  2 out of 2 members found this review helpful

  ThiodorNC

  2023-02-07

  Verified purchase

  This review is about the charging ports: 4

  The build quality is very good and not like some cheap Chinese chargers. It charges various types of batteries without needing separate chargers. The USB it has is very useful so you can have it on a power bank, solar panel, etc. I use it to charge only lithium batteries (Li-on). The screen it has is very good because all the information is displayed clearly, and the screen is LCD. It also has fast charging capability (QC2.0) which can fully charge a 3,000mAh battery in about an hour (I have tested it), but you need to have a fast charger for this function to be available. You can also choose the current voltage or how fast you want to charge the specific battery. There is also a battery restoration function that can restore lithium batteries (The screen will display "EE" if the specific battery is damaged or if it is inserted upside down). The only problem I had was when using AAA batteries, the information is a bit unreliable compared to lithium batteries. However, it is worth the money because it has a 1-year warranty, but you need to have the receipt with you unless it was purchased online. I would definitely buy it again.

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• 4

  Βαγγέλης Κουτσούκος

  2022-08-27

  Verified purchase

  Very good for charging 2 batteries simultaneously, good construction, not cheap. Personally, I don't use it heavily, but it hasn't overheated during long hours of use with 2 batteries. 4 stars solely for its slightly high price!

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• 1

  4 out of 5 members found this review helpful

  Giannis Kks

  2021-12-15
  This review is about the charging ports: 4

  First impressions. Good build quality, with quality plastics, readable and bright screen. The contacts in the slots are soft, while according to the company it is made 100% from slow-burning materials, thus presenting resistance in case of ignition. It essentially charges all types of batteries, so it will definitely cover you. In terms of practicality, 21700 batteries fit only in slots 1 & 4, for fast charging you will need a quick charge charger, otherwise you will receive speeds similar to the D4. The more batteries you charge simultaneously, the slower your speeds will be. The screen does not turn off in standby mode, which is a big mistake in my opinion, in the older D4 the screen turned off. Overall, a good charger, of good quality, which in my opinion is sold at a higher price than it should. You can do the same job with about half the money. However, if you want something of quality that will last for years, then give the extra amount.

  UPDATE. In less than two years it broke and the representative informed that it has only one year warranty. In the end, it is a bad product with poor support.

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• 5

  3 out of 3 members found this review helpful

  spirogero

  2021-10-15

  Verified purchase

  Serious charger. You can trust your valuable batteries to it. No comparison to anonymous cheap Chinese chargers. It is also Chinese (and who isn't nowadays), but it is one of the good ones.

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• 4

  2 out of 3 members found this review helpful

  insan3

  2021-08-24

  Verified purchase

  This review is about the charging ports: 4

  The tool is fine, but it could have been better.

  + Charging intensity selection (per 100 ah)
  + Fits almost all batteries
  + Powered by any Micro USB cable
  + Informs you about the charged Mah of the battery (so you can see its approximate capacity)

  - The screen never turns off completely! I don't think it would be a big deal to have a circuit that doesn't consume power in standby mode.
  - It does not discharge

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• 5

  gkithonas

  2021-08-17

  Verified purchase

  Very good charger
  I had an older model from nitecore and after almost 6 years of daily use, it delivered...

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• 2

  kostasboz

  2021-08-03

  During the first week, it does not charge from one battery. Although I had a good experience before with this model for the company. Disappointment!

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• 5

  1 out of 1 members found this review helpful

  abarberop

  2020-03-10

  Verified purchase

  I have used it for 18650 and even AA batteries and it does its job quickly and flawlessly. The indications are clear.

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• 4

  2 out of 3 members found this review helpful

  hobbyplayer1940

  2020-03-06
  This review is about the charging ports: 4

  Quite good for the charger's price. I did quite a bit of research before purchasing. I chose it because compared to the competition, it has the ability to select the current intensity in steps of 100mA. Additionally, it charges Lifepo4 cells. With the QC2 adapter, it is quite compact. It charges a Sanyo NCR18650GA-3500 in 1 hour and 40 minutes, with a capacity of 3547mAh. It reaches 80% in just 55 minutes. It can also accommodate 20700/21700 cells. The quality and finish are also good. The plastics do not have a strong smell like cheaper ones. However, one thing that is missing is discharge. This is quite an important feature that I couldn't find within this budget range from any company, and it deprives it of the fifth star. Alternatively, only Miboxer C4-12 or C4-Plus. However, it is not domestically available.

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• 1

  1 out of 25 members found this review helpful

  Vasilis_Koutsos

  2019-02-27
  This review is about the charging ports: 4

  The 18650 battery does not charge in 55 minutes, as stated in the instructions, it charges in 2 hours and 20 minutes, and its functions are incomprehensible!

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• 5

  ast7559

  2023-03-08

  Verified purchase

  This review is about the charging ports: 4

  One does his job just fine

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• 5

  Lazaros Efthymiadis

  2021-06-06
  This review is about the charging ports: 4

  I made two charges on eneloop and lion 18650. Satisfied

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