Nitecore Ci4 - 4 Bay Battery Charger

£18.99

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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.



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 & Returns

Delivery

  • Orders made before 1pm each working day will be shipped the same day.
  • We aim to dispatch orders placed 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 £35.00 will qualify for free DPD Tracked Next Day Delivery.
  • Orders under £35.00 will not qualify for free shipping, but will still be sent via DPD Tracked Next Day Delivery.
  • 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

Returns must be complete with the original packaging to us and/or our supplier (or any other UK address specified by us), We can provide you with a shipping label, or arrange for a courier to collect the package for return.
You must ensure that the goods are packaged adequately to protect against damage.

For refunds and returns, contact us via the contact us page.

Please note:

Refunds on cancellations are only issued on unused items in its unopened/undamaged packaging.

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.

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 cancellation for here.

Returns for cancellations are at the cost of the customer (£4.99), we can provide you with a shipping label, or arrange for a courier to collect the package for the return of the order.

Faulty Goods / Guarantee

If there is a problem with the goods, please notify us by email or in writing providing details of the problem.
It’s helpful if you can provide us with a digital photograph of the problem as this normally saves you having to return the goods for inspection.
We will deal with the matter in accordance with your legal rights. 
If deemed to be faulty, a refund to the payment method used, a replacement device, or alternative will be offered to you.

FAQ's

What batteries can I use?

You can charge most rechargeable batteries, like AA, AAA, 18650 and 21700. It works with both Li-ion and NiMH/NiCd batteries.

How fast does it charge?

With a fast USB-C power plug, one battery can charge up to 3A. If you charge four at once, each charges slower at about 0.75A.

Can I use it anywhere?

Yes, it works with USB-C power from wall plugs, power banks or even in your car, making it great for travel.

Is it safe?

Yes, it stops charging when the battery is full and protects against overheating, short circuits, and putting batteries in the wrong way.

Any tips?

Use a strong USB-C cable and good power plug for faster charging. Charge in a cool place and check your batteries before using.