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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🔌 Charge smarter, stay powered longer — never miss a beat!

SMART SCREEN INSIGHT - Dynamic LCD display keeps you informed with real-time battery health and charging progress.
ADAPTIVE INTELLIGENCE - Automatically optimizes current and voltage to maximize battery lifespan and safety.
TURBOCHARGE YOUR POWER - Up to 4000mA total output for lightning-fast dual battery charging.
UNIVERSAL COMPATIBILITY - Supports Li-ion, Ni-MH, Ni-Cd, IMR, and multiple battery sizes from AAA to 21700.
TRAVEL READY ORGANIZATION - Includes a sleek LumenTac battery organizer to keep your power essentials perfectly sorted on the go.

The Nitecore UMS2 is a dual-slot USB smart charger delivering up to 4000mA total output with intelligent current and voltage management. Featuring a clear LCD display, it supports a wide range of battery chemistries and sizes, including Li-ion, Ni-MH, Ni-Cd, and IMR. Perfectly paired with the included LumenTac organizer, it’s designed for efficient, safe charging whether at home or on the move.

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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.

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