My ums2 keeps going into reboot loop when at times inserting a 18650 battery; tried 2 brands of batteries; multiple usb cables; defective?

Have you tried a more powerful (output) USB adapter? If the issue persists, contact us (the seller) and we will have the issue resolved swiftly.

Will this unit charge a protected 21700 battery? I know it will accept the unprotected battery.

Yes. It can charge both protected and unprotected 21700 battery.

Does this unit have a discharge function?

No, it does not have a discharge function.

Does it test for battery capacity?

No. It does not display the capacity of the battery.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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

Product ID: 92483471

Details

Brand
Nitecore
Color
Black
Item Weight
5.56 ounces
Output Voltage
4.35 volts
Product Dimensions
2.87"D x x

⚡4000mA max dual-slot fast charge

📊Real-time LCD battery health & status

🔋Universal multi-chemistry & size support

¥9655

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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Description

🔌 Power Up Smarter, Charge Faster, Live Unstoppable!

SMART SAFE CHARGING 🔒 - Intelligent auto-detection adjusts voltage and current to maximize battery lifespan and prevent overcharging.
TURBOCHARGE YOUR POWER ⚡ - Delivers up to 4000mA total current for lightning-fast dual battery charging with USB-C Quick Charge compatibility.
STAY INFORMED STAY AHEAD 📊 - Dynamic LCD display provides live updates on battery health, charge status, and mode—never guess your battery’s condition again.
TRAVEL READY ORGANIZATION 🎒 - Includes a sleek organizer case to keep your charger and batteries neatly packed for on-the-go professionals.
VERSATILITY MEETS CONVENIENCE 🔋 - Compatible with a wide range of battery chemistries and sizes from 16340 to 21700, plus AA and AAA rechargeable cells.

The Nitecore UMS2 is a compact, intelligent dual-slot USB-C battery charger delivering up to 4000mA total current for rapid charging. Featuring a real-time LCD display, it monitors battery health and charging status while automatically optimizing current and voltage for multiple battery chemistries and sizes. Perfectly designed for professionals and travelers, it includes an organizer case for easy portability and supports a broad range of rechargeable batteries including Li-ion, Ni-MH, and Ni-Cd.

Specifications

ASIN	B07JN49XYM
Amperage	3000 A
Brand	Nitecore
Color	Black
Compatible Devices	IMR/Li-ion/LiFePO4: 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/Ni-Cd: AA, AAA, AAAA, C, D
Connector Type Used on Cable	USB
Current Rating	2 A
Customer Reviews	4.4 out of 5 stars 855 Reviews
Input Voltage	5 volts
Item Dimensions D x W x H	2.87"D x 5.98"W x 1.57"H
Item Weight	5.56 ounces
Manufacturer	NITECORE
Mfr Part Number	UMS2+ORG
Model Number	UMS2
Number of Items	1
Number of Packs	1
Number of Ports	2
Output Voltage	4.35 volts
Product Dimensions	2.87"D x 5.98"W x 1.57"H

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¥9655

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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