NITCORE UM4 4 BAY DIGITAL BATTERY CHARGER

Charge smarter, not harder, with the NITECORE UM4—a high-performance 4-bay USB digital battery charger built for versatility, precision, and safety. Whether you're recharging your vape batteries, flashlight cells, or backup power sources, the UM4 is engineered to deliver reliable, fast, and intelligent charging every time.

Designed to support a wide range of Li-ion and Ni-MH/Ni-Cd battery sizes—including popular formats like 18650, 20700, 21700, and 26650—this charger features independent slot control and up to 1500mA charging per bay for optimal efficiency. The intelligent detection system automatically selects the appropriate charging mode (CC, CV, or dV/dt) and current, preserving your battery’s lifespan while minimizing downtime.

A crisp, energy-efficient LCD screen gives you real-time charging stats, and a dedicated restoration mode helps revive over-discharged Li-ion and IMR batteries—so you're never stuck with dead cells. Built with flame-retardant PC materials and certified by RoHS, CE, FCC, and CEC, the UM4 takes safety as seriously as performance.

Nitecore UM4 4 Bay Digital Battery Charger Features

• Intelligent USB 4 Slot Charger
• QC 2.0 input available
• Capable of charging 4 batteries simultaneously and controlling each slot independently
• Up to 1,500mA charging speed in a single slot
• Compatible with Li-ion and Ni-MH/Ni-Cd batteries with automatic detection
• Automatic detection of battery power level and automatic selection of the appropriate voltage and charging mode (LiFePO4 and 3.8V Li-ion batteries excluded)
• Automatic selection between 3 charging modes (CC, CV and dV/dt)
  Energy-efficient LCD for real-time charging information
  Capable of manually selecting the charging cut-off voltage and the charging current
• Automatic detection of large/small capacity batteries and automatic selection of appropriate charging current
• Automatic termination upon charging completion
• Reverse polarity protection and short circuit protection
• Over-discharged battery activation
• Li-ion battery restoration
• Over-time charging protection
• Made from durable and fire-retardant PC materials
• Optimal heat dissipation design
• Certified by RoHS, CE, FCC, and CEC

THE BOX CONTAINS:

• Nitecore UM4 battery charger
• Micro USB cord
• User Manual
• Scratch-off validation serial number 

Why It’s Perfect for You

Whether you're a heavy vaper, EDC enthusiast, or battery-powered gadget pro, the NITECORE UM4 gives you full control over your power management. Its smart features, high compatibility, and rugged build make it the ultimate battery charging hub.

Get Powered Up at FlyingVape.com

Don't let dead batteries slow you down. Order your NITECORE UM4 4-Bay Digital Charger now at FlyingVape.com and enjoy trusted quality, fast shipping, and expert support—right where vapers shop with confidence.

Click here to shop now and keep your power on point!

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Note: All specifications and descriptions are based on information provided by the manufacturer. Information provided is not representative of testing and/or verification by www.flyingvape.com and should be used at consumers discretion. 

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Please make sure to fully comprehend the care and operation of the batteries/chargers you are using and how to care for them properly.

Note: There is always an inherent risk when using any rechargeable batteries. www.flyingvape.com and any of its parent and subsidiary companies cannot be held responsible for any damage for any modification of the batteries, chargers, devices and other products that we carry in any form or shape, this is including pack making.

www.flyingvape.com and any or all of www.flyingvape.com parent and subsidiary companies will not be held responsible or liable for any injury, damage or defect, permanent or temporary, that may be caused by the improper use of a Li-ion (Lithium-ion), LiPo (Lithium-ion Polymer) and any rechargeable battery/batteries as well as chargers.

When working with Li-ion (Lithium-ion), LiPo (Lithium-ion Polymer) and any rechargeable batteries, please exercise extreme caution as they are very sensitive to charging characteristics and may explode or burn if mishandled.

• Always charge batteries on a clean and fire-proof surface.
• Never leave charging batteries unattended.
• Do not use batteries that have any visible damages.
• Do not use any rechargeable batteries or battery chargers if it/they have been stressed through mishandling, accidental or otherwise, even if damage is/may not be visible.
• Always keep, store and transport the rechargeable batteries in a safe, non-conductive container, in a controlled environment.
• Always make sure to dispose batteries, chargers, and/ or any other electronic device in accordance with local laws and mandates.