Bob H.

The Nitecore UMS2 has been a great charger for my 18650 setup. I’m rotating multiple married pairs, and this unit is exactly what I needed: clear display, intelligent charging behavior, and USB-C convenience.

It charges quickly and safely, and I like being able to monitor charging status in real time instead of guessing. Build quality is solid, and it handles my vaping batteries with no drama. Paired with a quality GaN USB-C wall charger, it performs even better.

Only limitation: it’s a 2-bay charger, so if you’re charging many pairs back-to-back, it takes longer than a 4-bay. But for most people, the speed/safety/portability balance is excellent.

I bought 3 pairs of the Nitecore IMR 3100mAh 35A flat-top 18650s directly from Nitecore, and I’m very happy with the purchase. I use them in a SMOK G-PRIV 4 with a TFV18 Mini dual mesh 0.15 coil around 90W (Hard preheat), and performance is excellent.

Compared with my previous batteries, these feel more stable through the day, with less drop-off as charge gets lower. The hit stays consistent, and flavor clarity is better — especially on “ice” profiles, which now feel cleaner and more defined. They also seem to run cooler under load.

If you vape at higher wattages and want reliable power delivery, these are a strong choice. Just make sure to marry pairs and rotate them properly for best lifespan and safety.

Great powerful light!

Super brightlive this keychain light must get!!!

Excellent quality, very bright , I like how I can change out the battery on use the USB receptacle, I have another older Nitecore headlight that still works fine, the only thing that wears out is the headband.Fortunnatly Nitecore sells replacements.

Good quality, fits my discounted Surefire M600 and M300 lights perfectly.

I also had a Nitecore 18650 battery charger several years ago that worked perfectly and was reliable.

Cool little light. Easy controls. Perfect to grab for a walk or navigating around the campsite at night.

Great batteries. Works well with my devices. Holds charge when not in use. Reliable and powerful.

Just what I needed to get my headlamp working again.

Excellent little pocket light, great focal lens for solid beam. Three levels of power with concentrated beam. It charges quick but can alson run on a standard AAA battery!

It was pretty easy to use. and the different modes I could adjust the light to exactly what I needed. I do human and drug trafficking prevention in the guard rn so it’s been good for the long nights of searching

Very bright and great customer service highly recommend

Perfect switch for my SBR light kit I made here. Runs perfectly AND its brighter and cheaper than other companies out there!!

Mounted this to my plate carrier. PERFECT light and I have a red LED now too. Operates perfectly for night OPS.