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Nitecore 3A UMS4 Quad Slot Charger
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Original price was: $59.99.$26.99Current price is: $26.99.
Fall Clearance price, already marked down. Codes don’t apply. While supplies last.
The Nitecore 3A UMS4 Quad Slot Charger is a four-bay USB charger with an LCD readout for Li-ion, IMR, LiFePO4, Ni-MH and Ni-Cd batteries, including 21700s. It charges at up to 3A from a Quick Charge adapter.
In stock
Most orders ship within 24 hours on business days, except holidays. Orders placed on weekends or major holidays start processing the next business day.
| Option | Under $99 | $99 or more* |
|---|---|---|
| Standard shipping3–7 business days once shipped | $8.00 | FREE |
| PUDOpoint pickup3–5 business days, at a local counter | $8.00 | FREE |
| Adult signature (21+)Every shipped order | $8.00 | $8.00 |
Federal law requires an adult signature on every vape delivery: someone 21 or older signs and shows a valid photo ID.
Nitecore 3A UMS4 Quad Slot Charger Review
The Nitecore 3A UMS4 Quad Slot Charger is a four-bay USB charger for Li-ion, IMR, LiFePO4, Ni-MH and Ni-Cd batteries, including 18650s and 21700s. Its LCD shows each battery’s voltage, current, capacity and internal resistance, and it charges one battery at up to 3A from a Quick Charge adapter. See more from Nitecore or browse all battery chargers.
UMS4 Highlights
LCD Readout
The screen shows each battery’s voltage, charging current, charged capacity and charging time, plus its internal resistance and a Good or Poor health rating.
Up to 3A
With a Quick Charge adapter, one battery charges at up to 3A, two at 2A each or four at 1A each. On a standard 5V 2A adapter, those drop to 2A, 1A and 500mA.
Set Current and Voltage
The UMS4 picks the current and charge mode itself. Hold C to set the current, in 100mA steps, or the cut-off voltage, such as 3.7V for LiFePO4.
IMR Restoration
Holding V starts a restoration mode for over-discharged IMR batteries. Nitecore warns that reverse polarity protection is off during it, so put the battery in the right way.
UMS4 Specs
Charging
- Bays: 4
- Batteries: Li-ion, IMR, LiFePO4, Ni-MH and Ni-Cd
- Charge voltage: 4.35V, 4.2V, 3.7V or 1.48V
- Charge current: up to 3A (see the table)
- Charging modes: CC, CV and −dV/dt, chosen automatically
Battery Sizes
- Li-ion, IMR, LiFePO4: 24 sizes from 10440 to 26700, such as 16340 (RCR123), 18350, 18650, 20700, 21700 and 26650
- Ni-MH, Ni-Cd: AA, AAA, AAAA, C and D
UMS4 Charger
- Input: USB, 5V 2A, or up to 18W from a Quick Charge adapter
- Display: LCD with health, internal resistance, voltage, current, capacity and time
- Buttons: C and V
- Protection: reverse polarity, short circuit and a 20-hour cutoff per bay, with an automatic stop
- Size: 159 × 107 × 41mm
- Weight: 255.4g without the cable
- Body: fire-retardant PC
UMS4 Charge Current
Nitecore’s manual gives these maximum currents:
| Batteries charging | Quick Charge adapter | Standard 5V 2A adapter |
|---|---|---|
| 1 | 3A | 2A |
| 2 | 2A each | 1A each |
| 4 | 1A each | 500mA each |
Nitecore says to keep Li-ion, IMR and LiFePO4 charging current at or under 1C, so set it lower by hand for small, long batteries such as 14650s.
Batteries
Charge only rechargeable Li-ion, IMR, LiFePO4, Ni-MH or Ni-Cd batteries, never alkaline or CR123A cells, and don’t leave the charger unattended while it’s plugged in.
How to Use the UMS4
- Plug it in: connect the USB cable from the box to a USB wall adapter (not included). A Quick Charge 2.0 adapter unlocks the full 3A.
- Load the batteries: insert each battery with its ends matching the + and − marks. The UMS4 checks it and starts charging.
- Change settings if needed: hold C to set the current or cut-off voltage, press V to adjust, then hold C again to save. LiFePO4 and high-voltage Li-ion need the voltage set by hand.
- Read the screen: press C to switch between the four bays and V to step through the readings.
Who the UMS4 Is For
The Nitecore UMS4 suits vapers who charge several 18650 or 21700 batteries at once and want to check each one’s health and internal resistance. For a smaller two-bay USB charger with the same screen, see the UMS2.
Good to know: No wall adapter comes in the box, and on a standard 5V 2A adapter, four batteries charge at 500mA each.
What’s in the UMS4 Box
- Nitecore UMS4 charger
- USB charging cable
- User manual
Nitecore UMS4 FAQ
Does it charge 21700 batteries?
Yes. Nitecore lists 20700, 21700 and 26700 batteries, along with 18650s and 26650s. We sell IMREN 21700 batteries in 2-packs.
How fast does it charge?
With a Quick Charge adapter: 3A for one battery, 2A each for two or 1A each for four. A standard 5V 2A adapter gives 2A, 1A and 500mA.
What does the screen show?
Each battery’s health (Good or Poor), internal resistance, charging current, voltage, charged capacity and charging time. Press V to step through them and C to switch bays.
Does it come with a wall adapter?
No. It comes with a USB cable. Use a Quick Charge 2.0 adapter for up to 3A, or a standard 5V 2A USB adapter for up to 2A.
Can it charge LiFePO4 and Ni-MH batteries?
Yes. It detects Li-ion and Ni-MH batteries itself; for LiFePO4, hold C and set the cut-off voltage to 3.7V.
How is it different from the UMS2?
The UMS2 has two bays instead of four and is smaller, with the same LCD, buttons and 3A top speed.
- Reviews
- Questions
USFast Charge
Charges Fast!!! Very good quality
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