Nitecore Ci4 4 Bay Battery Charger

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Nitecore UM4 Intelligent USB Battery Charger – 4 Slot Fast Charger

The Nitecore UM4 Intelligent Charger is a powerful four-slot USB battery charger designed for fast, efficient, and safe charging of a wide range of rechargeable batteries. With the ability to charge up to four batteries simultaneously and control each charging bay independently, the UM4 is ideal for users who need reliable multi-battery charging for vape batteries and other rechargeable cells.

The charger offers a maximum output of 1500mA in a single slot when connected to a 9V 2A QC 2.0 adapter, enabling faster charging speeds compared to standard USB chargers. It also features a charging programme specially optimised for IMR batteries, carefully monitoring the entire charging process to ensure safe cut-off voltage and extend battery lifespan.

The integrated LCD display provides detailed real-time charging information, giving users full visibility over battery performance and charging progress.

Key Features

  • Four-slot intelligent battery charger
  • Independent charging control for each slot
  • Maximum output of 1500mA per slot
  • Supports QC 2.0 fast charging (9V 2A adapter required)
  • Optimised charging programme for IMR batteries
  • Intelligent charging management for improved battery lifespan
  • Real-time LCD display showing detailed charging information
  • Automatic battery detection and charging mode selection
  • Manual charging parameter adjustment available

LCD Display Information

Press the “V” button to cycle through the following real-time information:

  • Charged capacity and charging time
  • Charging current and battery voltage
  • Battery type
  • Cut-off voltage
  • Charging mode

The charger automatically selects one of three charging modes depending on battery type and capacity. Users can also manually adjust settings by long pressing the “C” button to enter charging configuration mode.

Battery Restoration Function

The Nitecore UM4 supports over-discharged IMR battery restoration.

  • If an over-discharged battery is inserted, the screen displays “EE EE”
  • Long press the “V” button to enter battery restoration mode

The “EE EE” warning will also appear if:

  • A battery is inserted incorrectly (reverse polarity)
  • A battery is short-circuited

Compatible Battery Types

The Nitecore UM4 supports a wide range of rechargeable batteries.

Li-ion / IMR / LiFePO4 Batteries:

  • 10440
  • 14500
  • 14650
  • 16340 (RCR123)
  • 16500
  • 16650
  • 17350
  • 17500
  • 17650
  • 17670
  • 17700
  • 18350
  • 18490
  • 18500
  • 18650
  • 18700
  • 20700
  • 21700
  • 22500
  • 22650
  • 25500
  • 26650
  • 26700

NiMH / NiCd Batteries:

  • AA
  • AAA
  • AAAA
  • C
  • D

Safety Features

  • Intelligent charge monitoring
  • Automatic charging cut-off
  • Reverse polarity protection
  • Short-circuit detection
  • Battery health monitoring

The Nitecore UM4 is an excellent choice for users who need a versatile, high-performance multi-battery charger with advanced monitoring, fast charging capability, and wide battery compatibility.




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What happens if I don't like it?

If you have any queries regarding our products, you can call us on +44 (0) 1642 244973.

To contact us via email, please complete the form below.

How fast is shipping?

All orders placed and packed before 2pm are sent via next day delivery.

What's the returns policy?

Delivery

  • Orders placed and paid before 1pm each working day will be shipped the same day.
  • We aim to dispatch orders placed and paid before 3pm the same day however sometimes this is not always possible.
  • All orders placed after the cut off will be dispatched next working day.
  • We do not dispatch any items on Saturday or Sunday so any orders placed after cut off on a Friday will be dispatched the following Monday.
  • We do not dispatch any items on bank holidays. Any orders placed on a bank holiday weekend, will be dispatched the following Tuesday upon us re-opening.
  • Once your order has been received, we will send you confirmation of your order via email.
  • Orders over £150.00 will qualify for free DPD Tracked Next Day Delivery.
  • Orders under £150.00 will not qualify for free shipping, but will still be sent via DPD Tracked Next Day Delivery.
  • International orders will be sent via UPS (fees may apply depending on size/weight of delivery and location of order).
  • For international orders the buyer assumes responsibility over their purchase once it has left our distribution centre. Please check your local laws, any items refused by customs in the country of delivery and those your purchase may travel through are out of our control and may be destroyed. Items not cleared through customs may be returned to us or they may be destroyed by customs at their discretion. In the event of a missing international order that is not returned to us we reserve the right to not issue a refund or replacement.

Returns

For refunds and returns, contact us using our returns page.

Please note:

Refunds are only issued on unused items in its unopened/undamaged packaging. If your item is faulty we can only issue a replacement or a credit note. Items that have been returned as faulty will be sent back to you if we find nothing is wrong with the item or if the problem is due to your mishandling/abuse of the product. It’s your responsibility to return the items to us and needs to be done promptly at your cost.

Returns accepted up to 30 days from date of purchase, after 30 days a faulty item must be returned to the manufacturer directly.

A return will not be accepted for stock that has gone out of date in your possession.

Cancellations

If you choose to cancel your order, you have within 14 days of receiving your order. Please find our online cancelation for here.

Why should retailers stock the Nitecore Ci4 Battery Charger?

The Nitecore Ci4 is a professional-grade 4-bay charger offering fast, intelligent charging for multiple batteries at once. Its advanced technology and brand reliability make it a premium, high-demand accessory for retailers.

Who is this charger best suited for?

Ideal for customers who regularly use multiple rechargeable batteries — including vapers, torch users and gadget enthusiasts. Perfect for those seeking a trusted, efficient charging solution with safety and performance in mind.

What are its key features?

Features four independent charging bays with intelligent current distribution and fast-charging capability up to 3,000mA per slot. Compatible with a wide range of Li-ion and Ni-MH batteries. Includes LED charge indicators, USB-C input and multiple safety protections.

How popular is this charger with UK Vape Supply Ltd customers?

A strong seller at UK Vape Supply Ltd, praised for its convenience, reliability, and Nitecore’s industry-leading build quality. Retailers report steady sales and excellent feedback from customers upgrading from smaller chargers.

What’s included with each unit?

Each Nitecore Ci4 Charger comes complete with a 4-bay charging unit, USB-C power cable, and user manual, all packaged in Nitecore’s branded retail box.