Nitecore UMS2 Intelligent Dual-Slot Quick USB-C Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries, with Organizer

As someone who hadn’t upgraded their 18650 charger in quite a while, this UMS2 feels like a huge step up. The design is sleek and compact, yet it delivers an impressive amount of information, showing not just charge status and level, but also how long it’s been charging, the total capacity charged, the rate, and even the battery’s health. It’s packed with intelligent features, automatically detecting battery size, type, and optimal voltage, and adjusting the charge rate based on power input. You can still fine-tune settings manually if you want, which is a nice touch if needed. The USB-C connection makes it more universally compatible (though note it doesn’t come with a wall plug), and the included 2-battery organizer case is a nice bonus. Charging speed is much faster and more consistent than my older LUC D2, and the spring-loaded battery bays are smooth and easy to adjust for different sizes. The wide compatibility with various battery types and material builds makes it a very versatile tool for home use. My only minor wish is for an auto-off feature, but otherwise it’s silent, efficient, and very well-designed, at a great price for the value. Hopefully it holds on just as long as my old charger as well! So far, I’m thoroughly impressed and would definitely recommend!

Works well and charges my batteries fast. I had an old charger from the same brand and it used to charge my batteries from 2-3 hours and this one can do it from 1.5-2 hours. I’m happy with my purchase, thanks!

Amazing charger

The charger works very well so far. The charger identifies the chemistry type, tests the internal resistance then proceeds to charge the battery. It then cycles through the displays to show you information as it charges. The USB C port on the back make the charger more versatile, it supports a fast charge mode or regular slow charge modes. I prefer the slow modes since a slowly charge battery is usually happier. Every battery I've put in it so far it has been more than happy to charge. Update, it makes a pretty horrid electrical squeal sometimes. Keep it a ways away from yourself so you don't have to hear it. Knocked a star for that since it's a pretty irritating noise.

I have been using their head lamps and chargers for well over 20 years, as a truck tech, pretty much all day in some cases, never has Nitecore failed me with head lamp or charger!!

Excellent charger, solid and I can count on its quality every time.

I took this as my primary charger for a two week long road trip. I used a short micro USB cable to charge a few items (flashlight, headlamp, and this battery charger), and it worked fine with everything except this charger. This charger just wouldn't power on with that cable. The charger still "works", just not with every micro USB cable. Pros: 1. Adjustable contacts allow you to charge many different battery sizes Cons: 1. Overly complicated menu layout 2. Poor instructions 3. Charging contacts do not self align causing the batteries to slip out 4. Limited to charging two batteries at a time 5. Outdated micro USB interface - should be USB C 6. Won't power on with just any micro USB cable 7. Never quick charged anything, even with a 65w capable power brick. 8. I'm outside of the return window now

Works great so far no issues, would buy another if needed!

Bed product .No accuracy .