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.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Nitecore 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

Nitecore 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

🔋Universal multi-chemistry & size support

Description

🔌 Power up smarter, faster, and safer — never run out of juice again!

SMART SAFE CHARGING 🔒 - Automatically adjusts current and voltage to maximize battery lifespan and prevent overcharge.
TURBOCHARGE YOUR POWER ⚡ - Delivers up to 4000mA total output with QC2.0+ USB for lightning-fast dual battery charging.
STAY INFORMED INSTANTLY 📊 - Bright LCD screen keeps you updated on battery health, charging 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.
ALL IN ONE BATTERY COMPATIBILITY 🔋 - Supports Li-ion, Ni-MH, Ni-Cd, IMR, and common sizes from AAA to 21700 — perfect for every device.

The Nitecore UMS2 Dual Slot USB Smart Battery Charger offers ultra-fast charging up to 4000mA total output with QC2.0+ support, a clear LCD display for real-time battery and charging status, and intelligent charging technology that protects and extends battery life. Compatible with a wide range of battery chemistries and sizes, it’s the ultimate all-in-one charger for professionals and travelers alike, complete with a handy battery organizer for on-the-go convenience.

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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews