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.Duty & taxes paid at delivery

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UMS2 Dual Slot USB Smart Battery Charger for Li-on/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and Other Batteries with Battery Organizer

Product ID: 740204718

Details

Brand
Nitecore
Colour
Black
Item weight
5.56 Ounces
Output voltage
4.35 Volts
Specification met
CE

⚡4000mA max dual-slot fast charge

📊Real-time LCD battery & charge status

🔋Supports Li-ion/NiMH/IMR/AA/AAA batteries

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99553CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

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Description

🔌 Power up smarter, faster, everywhere you go!

SMART SAFE CHARGING 🔒 - Intelligent current and voltage adjustment protects batteries and extends their lifespan.
TURBOCHARGE YOUR POWER ⚡ - Dual slots deliver up to 4000mA total for lightning-fast charging with QC2.0+ USB adapters.
STAY INFORMED INSTANTLY 📊 - Bright LCD screen keeps you updated on battery health, charge mode, and progress in real time.
TRAVEL READY ORGANIZATION 🎒 - Includes a sleek LumenTac battery organizer to keep your power essentials neat and accessible on the go.
UNIVERSAL BATTERY COMPATIBILITY 🔋 - Works seamlessly with Li-ion, IMR, Ni-MH, Ni-Cd, and common sizes like 18650, AA, AAA, and more.

The Nitecore UMS2 is a dual-slot smart battery charger delivering up to 4000mA total output with QC2.0+ USB power sources. Featuring a real-time LCD display, it intelligently adjusts charging current and voltage to protect and extend battery life. Compatible with a wide range of battery chemistries and sizes—including Li-ion, IMR, Ni-MH, AA, and AAA—this compact charger also includes a LumenTac organizer, making it the perfect travel companion for professionals who demand efficient, safe, and versatile power management.

Specifications

ASIN	B07JN49XYM
Amperage	3000 Amps
Brand	Nitecore
Color	Black
Current Rating	2 Amps
Customer Reviews	4.4 4.4 out of 5 stars (791)
Input Voltage	5 Volts
Item Weight	5.56 Ounces
Manufacturer	NITECORE
Mfr Part Number	UMS2+ORG
Model Number	UMS2
Number of Ports	2
Output Voltage	4.35 Volts (DC)
Specification Met	CE

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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99553CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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