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Maximize the potential of your batteries with the Nitecore UM4, an intelligent multi-bay charger designed for versatility and efficiency. Equipped with four charging slots, the UM4 can handle various battery sizes, including 20700 and 21700 types, ensuring all your power needs are covered. This charger features multiple charging speeds, a bright digital LCD for real-time charging updates, and comprehensive built-in safety protections. Whether for daily use or intensive charging needs, the UM4 delivers performance, convenience, and safety, making it an essential tool for all your charging requirements.
- Flexible Charging Options: Offers multiple charging speeds with a maximum of 1.5A in single slot quick charge mode, adapting to your specific battery needs.
- Comprehensive Compatibility: Fits a wide range of battery sizes including 20700 and 21700, along with support for Li-ion and Ni-MH/Ni-Cd batteries, thanks to automatic detection features.
- Real-Time Monitoring: The bright digital LCD display provides detailed real-time information on charging status, voltage, current, and more.
- Advanced Safety Features: Equipped with protection against short circuits, overcharging, and incorrect battery insertion, ensuring a safe charging environment.
- Intelligent Design: Capable of independently controlling each slot, automatically selecting the optimal charging mode and adjusting the current as needed.
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: 1500mA*1 (MAX), 1500mA*2 (MAX), 750mA*4(MAX)
- Standard Mode: 1500mA*1 (MAX), 1000mA*2 (MAX), 500mA*4 (MAX)
- Dimensions: 159 x 107 x 41mm
- SIZE/TYPE COMPATIBILITY - ✔ 18650 ✔ 20700 ✔ 21700
- Nitecore UM4 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.
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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).
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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.
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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.
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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.
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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.
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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 16 reviews.
See title of review
It does a wonderful job of charging batteries and keeps them topped off ! No complaints!
Works very well thank you
small usb charger can't beat that!!
Works well
This is a very unique charger it revitalized my lithium ion batteries that I've used over 5 years and they work like new. Thank you for that charger save me a bunch of bucks.
Good display rotates charge information for each cell inserted. Tons of room for xx700 batteries, like 6mm extra so no more torn wraps. -1 star for the lack of a wall block for the included micro USB charging cord.
Work well
Great charger
Works Great!
Works great, I like the digital readout.
Great experience!
Works good
THE best!
I didnt notice it is usb-c which is my bad but no wall brick is annoying