Michael M.
Excellent charger for the price. However keep in mind it only comes with a usb cable so if you don’t have a plug in your junk drawer you will need to get 1
Eric v.
This thing is nice! Lots of features, easy to use. Don't forget to use Qualcomm 2.0 for fast charge.
Nathaniel M.
Great 4 bay charger! Plenty of visual info and the fact it also does Ni-MH as well seals the deal. Thanks 18650batterystore!
Uyana S.
Works quick. Easy to read.
Jeff Y.
The charger charges via micro usb so it's very slow if your charging more than one battery; not recommended. Other features are good/ok.
QUERUBIN B.
I was told to buy a name brand recharger. this charger is & the price is right
Zeke M.
very solid and good quality. I mean this is the best charger i have ever used. multi-functional very good performance and inteligent charger. thanks very much <3
Stéphane L.
seul point négatif, il y a pas d ac power inclue avec, il y a juste un câble usb pour le chargement.
only negative point, there is no ac power included with, there is just a usb cable for charging
Robert G.
Best feature of the charger is its simplicity for charging 18650 batteries. But, the manual is fairly complicated if you are not an electronics expert. I am still confused about charging a battery up to 3500 mAh when the readout shows only about 2200 at the end of the charging cycle. The helpful chat guy said it adds 2200 to what you have already, but that doesn't make sense to me. However, my doorbell is staying well charged.
Charles
Works with all my rechargeable batteries
I had a cheap charger that malfunctioned and caused my battery to overheat and melt the plastic wrapping. It really scared me. I decided I wanted to get a really good charger and good batteries. However, when I went to Amazon, I was overwhelmed and confused as to what was a good charger and good batteries. So, I went web searching for an expert online shop for battery charging. I was impressed with all the information and recommendations presented on 18650 Battery Store. I settled on the Nitecore UM4 because of the USB charging that allows me to charge with my auto jumper pack usb port during power outages. I've charged my 16850, AA, and D cells and this charger works great. It is just what I was hoping for. I feel safe with this charger.
RiODiGie
Great price, fast shipping, name brands!
I have placed two orders in the past year. Both times the prices were the cheapest. The shipping was incredibly fast, and they carry all the name brands and models that I was looking for. Very happy with the overall experience, in fact, I won't buy a battery charger from anyone else going forward!
Bruce Wineman
Digital Charger
Thus far it is working well. It has a learning curve that I am still negotiating.
Trips
Great Charger
Fits 21700s like no other. The first one I got from amazon had issues, very temperamental detection of poor/good health from slot to slot with same batteries at the same moment, and would slow charging down on “poor” batteries that were detected as such erroneously. Manually setting the charging rate did nothing to remedy that. So I returned it to amazon, bought it here instead and now it does 100% of what it is spec’d to do. Awesome charger and I’m glad I didn’t give up on it after the first one.
Chris M
My favorite charger out of 4
I have had a hohm tech 4 port, the purple 2 port charger, and one other since 2016. This charger is the best because it doesn't feel like the tension is overly strong. So it's not a struggle to get the batteries in and out. The metal connects better to the batteries. I don't have to slide the batteries around to get a connection ever. Especially on rewrapped batteries. Being able to see the resistance is really nice. The only feature missing is no Mah capacity test. But that is rarely used and the resistance will tell you if the batteries are bad anyways. So this is my favorite charger.
Themetalguy
Um4
Works well, has good features
Kevin Galimba
Great charger
No problems so far. Charged up my new batteries and I like the LCD screen. Pretty colors.
Anthony Maiorca
Very handy
This is a handy charger. It charges a variety of Li-ion and other batteries. Good price.
david klatt
UM4 4 Bay Digital LCD Battery Charger
Excellent quality and works perfectly
Anthony Acevedo
Nitecore UM4 4 Bay Digital LCD Battery Charger :
Great , quick charge , clear digital display , portable , well worth the price .
Howard McCord
Good product
Works as advertised. Did not come with charging block, only a usb cord
Michael Jacobs
Quick shipping
On point quick shipping items in perfect condition.
WILLIAM Malanoski
Um4
Great product. Charges fast and gives all valuable information on the cells.
Robert Villela
Upgrade original charger
Love the digital screen that shows how the batteries are charging !
Randy Sheick
Battery store. Nitecore um4 LCD charger,works w
Every thing works fine . Would reconmend!!
Terrill Woosley
Nice
Love the read outs.
Unknown
supercharger
charger works better than the ones I currently own. service was much faster then I expected. phone help was excellent
Jon Darcey
A great charger
It's easy to use and does a geed job
WALEED MIRZA
Quick charging with information displayed on it.
This charges charges batteries pretty fast. I can read all kind of information about charging on the charger. Would have been great if I could see the ETA for charging to complete as well. But still it is a great charger.
Unknown
Switched from the NC new i4
Got me some new, bigger batteries and the xx700s only barely fit in the other charger and I felt I risked torn wraps. This charger takes them EASILY. When the screen "dims" for energy saving, it is barely noticeable. Docked it a star for insufficient dimming and moved the unit from the bedroom to my computer desk. The battery info is nice to have. I now have a general idea of how my cells are holding up besides charging/charged.
David Reisinger
Great charger
Love this charger, does a quick diagnosis before charging.
Allen Campbell
Fast and reliable
Compared to the previous two chargers we've been using, the Nitecore UM4 is quite fast charging. 1-2 hrs instead of 8-20 hrs. It also gives you a digital readout of everything you need to know about your battery. I highly recommend it. And the service was great. I received my order in only a few days.
Bernard Custeau
charger
Work good!!thank's!!
Richard Maxwell
Great Charger
Very happy with purchase. Great charger.
Unknown
A+
Best deals online for real chargers and battery
Wilbur McGehee
Nitecore UM4
The UM4 is more than just a charger. It is also a limited battery analyzer. It gives the pertinent information about the battery condition.
RichH
Nice battery charger
Works very well with my solar system. Charges very well. Adjusts to work better with batteries as they charge. Easy to work. Simple instructions.
Jace
Awesome
I had their old two bay charger and loved it but decided to upgrade and found this gem and absolutely love it the display is amazing and provides tons of info and has plenty of options.
18650
