Works great, does everything it says it does....
Unlock rapid and reliable battery charging with the Nitecore UMS2, a powerful dual-slot USB charger tailored for 18650 and 21700 batteries. Featuring advanced Quick Charge capabilities and a digital LCD display, the UMS2 offers up to 3A charging speeds per slot, ensuring your batteries are quickly ready for use. Its intelligent design accommodates various battery sizes and types, with automatic detection and optimal charging strategies for each. Safety is paramount with built-in protections against overcharging, short circuits, and improper insertion, making the UMS2 a safe choice for all your charging needs.
- Fast Charging: Delivers rapid charging with up to 3,000mA in a single slot under Quick Charge mode, maximizing time efficiency.
- Universal Compatibility: Accommodates a wide range of battery types and sizes, including 20700 and 21700, with specialized modes for Li-ion, Ni-MH, and Ni-Cd batteries.
- Intelligent Display: Features a bright, energy-efficient LCD that provides real-time charging data to monitor the progress and status of each battery.
- Advanced Safety Features: Equipped with comprehensive protection mechanisms such as reverse polarity protection and automatic termination to prevent overcharging and extend battery life.
- Durable and Efficient Design: Constructed from fire-retardant materials with an optimal heat dissipation design, certified by RoHS, CE, FCC, and CEC for added reliability and safety.
Compatible with:
Lithium Ion IMR or LiFePO4 Batteries:
10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490,18500, 18650, 18700, 20700, 21700, 22500, 22650,25500, 26500, 26650, 26700
NI-MH / NICD:
AA, AAA, AAAA, C, D
Technical Info:
- Input: DC 5V/2A 9V/2A 18W (MAX)
- Output: 4.35V±1% / 4.2V±1% / 3.7V±1% / 1.48V±1%
- Output current: QC Mode: 3,000mA*1 (MAX) 2,000mA*2 (MAX)
- Standard Mode: 2,000mA*1 (MAX) 1,000mA*2 (MAX)
- Dimensions: 5.98" x 2.87" x 1.57"
- SIZE/TYPE COMPATIBILITY - ✔ 18650 ✔ 20700 ✔ 21700
- Nitecore UMS2 battery charger
- Micro USB cord
- User Manual
- Scratch-off validation serial number
⚠ Important Safety Warnings
Improper use of a battery charger can result in overcharging, short circuits, or damage to the battery, causing FIRE, EXPLOSION, or ELECTRICAL SHOCK. Users must follow all safety guidelines to ensure proper operation. Click here to review the full safety guidelines.
-
Device Compatibility:
- Use the charger only for compatible battery types and sizes as specified by the charger manufacturer. Ensure the charger is appropriate for the battery chemistry, size, and protection status (e.g., unprotected or protected cells).
- Do not charge non-rechargeable batteries (e.g., alkaline or primary cells).
-
Proper Use:
- Only charge batteries in a fireproof or non-flammable area. Avoid charging on beds, couches, or other flammable surfaces.
- Do not force a battery into the charger slot if it does not fit properly. This can damage the charger or battery and may result in unsafe charging conditions.
- Inspect batteries before charging: Do not charge if the battery casing, wrapper, or terminals are damaged, dented, leaking, or bulging.
- Never leave batteries unattended while charging. Monitor the charging process, and unplug the charger when charging is complete.
- Avoid exposing the charger to liquids, high heat, or direct sunlight.
-
Inspection:
- Do not use the charger if the power cord, plug, or device is damaged.
- Inspect both the charger and the battery for any signs of damage before use.
-
Storage & Handling:
- Keep the charger away from children and pets.
- When not in use, unplug the charger and store it in a cool, dry place.
-
Prohibited Activities:
- Do not modify or disassemble the charger.
- Do not attempt to repair a damaged charger—replace it with a new one.
- Avoid using extension cords or adapters that exceed the manufacturer’s recommendations.
-
Emergency Response:
- If the charger or battery emits smoke, sparks, or a burning smell, disconnect the power immediately and move the battery and charger to a safe area.
- In case of fire, use a Class D fire extinguisher or sand to extinguish the flames.
Disclaimer
IMR Batteries is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Battery chargers must only be used with compatible battery types and operated in accordance with manufacturer instructions. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to their customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.8 / 5 from 21 reviews.
Quick charge, monitors battery health, simple and straightforward to use. Great charger and upgrade for me. (This was an upgrade purchase as I had an older Nitecore charger.)
Charger arrived quickly and works great
Instructions (language) a bit user unfriendly for those not well versed in electronic terminology and functionally. VERY nice machine for the money though!
Charges batteries quickly without getting hot, big plus for me. This is a replacement for the first one I order couple of years ago. I trust nitecore their chargers have never let me down
Great charger for all kinds of battery sizes with no problems with 21700 easily fitting into the slots. The battery health feature is very helpful too..
I bought this charger because it packed a lot of information on a small display. I absolutely love how this charger can all my flashlight batteries and provide me critical information about its battery life, voltage, and charging rate.
would have liked a wall plug
So far so good.
great little charger, only issue is if you dont already have a QC power block than you cannot use the quick charge feature or you will have to spend $10-15 to get one (QC does work great when you have the correct type)
works great. it was actually an upgrade from the D2.
My best charger yet
Best charger you can buy that doesn't destroy your battery wraps! High quality and never failed me.
Works great for 18650 or 21700
I haven't had this very long but it seems to work ok . I have always used XSTAR chargers but my last three have ALL broke where the spring attaches to plastic post and I have been careful to NOT let the spring snap back when removing the battery . I hope this does not happen to the Nitecor .
Have always used nitecore chargers & am so happy to see the new specs added to this one. The ums2 does not get hot like my other nitecores have done & it is much easier for me to set charging strenghts. The displays shows all u need to know about battery & if its good to charge or not. Very happy with this purchase & the fast shipping from IMR.
Full disclosure, it's so simple, I thought I was doing something wrong.
Everything arrived in good order & on time. No complaints. The Nitecore UMS2 Lithium ion, 2-slot charger works as it should but I see that charging speed is adjusted automatically. It is variable but not selectable as described. Selecting is possible but the selection is overridden by auto. USB powered. It's ok tho. A fairly slow charge at about 3.5 hrs for two batteries. Batteries, wraps, storage boxes & insulators are top notch. Thanks IMR!
Sweet charger that wont burn down the house
I have ordered from IMR before. Order was well packaged. Good place to get batteries and chargers. Will order from this company again.
Great charger for all kinds of battery sizes with no problems with 21700 easily fitting into the slots. The battery health feature is very helpful too..