Charge two 18650, 21700 or AA cells fast, and watch every detail on the screen.
An intelligent two-bay charger that reads each cell, picks the right current and shows you voltage, capacity and health while it works.
- Two independent bays, each charging its own cell at its own pace
- Up to 3,000mA in a single bay, about 55 minutes to 80% on a 3,500mAh cell
- 4,000mA total output when both bays are loaded over a QC source
- LCD readout of current, voltage, capacity, internal resistance and time
- Charges IMR, Li-ion, LiFePO4, Ni-MH and Ni-Cd from 10440 up to 26700, plus AA to D
- Reverse polarity, short circuit, overtime and over-discharge protection built in
- Fire-retardant PC body with cooling fins for safe, stable charging
Fast enough to charge between trips.
With a QC source plugged in, a single bay pushes up to 3,000mA, taking a 3,500mAh cell to about 80 percent in roughly 55 minutes. Drop a flat 21700 in after work and it is ready for the head torch or the EDC light by the time you have eaten.
Load both bays and the UMS2 shares its 4,000mA total across them, so a pair of cells still tops up quickly while you get on with packing.
See exactly what each cell is doing.
The LCD shows live charging current, voltage, charged capacity, internal resistance and elapsed time, alongside the charging mode it has chosen. A glance tells you how full a cell is and whether an old one is still healthy.
When you want to take charge yourself, set the charging current and cut-off voltage by hand for a particular cell. The information enthusiasts want is right on the panel.
One charger for the whole battery drawer.
The UMS2 reads each cell, identifies the chemistry and capacity, then selects the right voltage and one of three charging modes. It handles IMR, Li-ion, LiFePO4, Ni-MH and Ni-Cd cells from a 10440 up to a 26700, plus AA, AAA, AAAA, C and D.
That covers the cells in your flashlights, head torches, cameras and tools, so one unit sits on the bench instead of a tangle of single-cell chargers.
Two bays that charge on their own terms.
Each bay runs its own charging cycle, so a half-empty 18650 and a fully flat 21700 each get the current they need at the same time. Pull one out the moment it is done and leave the other to finish.
The total output reaches 4,000mA from a Quick Charge source, with up to 2,000mA going to each cell when both bays are working together.
Power it from whatever you have on hand.
The UMS2 takes its power over a single USB cable, so a wall adaptor, a power bank or a solar panel can all run it. On a camp trip or a long drive, top up your cells from the same battery pack that charges your phone.
It accepts a QC 2.0 input for full speed, and falls back gracefully to a standard USB supply when that is all you have.
WHY THE UMS2 OVER A BASIC CHARGER
You can read the cell, not guess
The LCD shows live current, voltage, capacity and internal resistance. A simple charger gives you a single status light and no way to spot a tired cell.
Up to 3,000mA, not a slow trickle
A single bay charges at up to 3,000mA over QC, so cells are ready in well under an hour rather than overnight.
One unit for every chemistry
IMR, Li-ion, LiFePO4, Ni-MH and Ni-Cd from 10440 to 26700 and AA to D, all detected automatically. Most basic chargers stick to one or two sizes.
Protection you can leave running
Reverse polarity, short circuit, overtime cut-off and temperature regulation keep an unattended charge safe. A cheap charger often has none of these.
Safe charging you can walk away from.
A built-in temperature regulation system watches the heat and keeps the charge stable, while reverse-polarity, short-circuit and overtime protection guard against the usual mistakes. Leave a pair of cells charging while you sleep or work, and the UMS2 holds them safe.
Over-discharged cells get an activation step, and Li-ion restoration can bring a flat cell back, giving older batteries another run instead of the bin.
Built to take a knock and shed heat.
The shell is moulded from fire-retardant PC, so it stands up to the rough and tumble of a kit bag and to the demands of higher-current charging. Cooling fins along the body draw heat away from the cells for a steady charge.
At 157.7g and 152mm long, it slips into a pack as easily as it sits on the bench at home.
WHERE THE UMS2 EARNS ITS PLACE
Flashlight & EDC
Keep a pair of 18650 or 21700 cells topped up and ready, with the screen showing which one still has life left.
Home Battery Bench
One charger for the whole drawer, from camera 16340s to AA and D cells, each detected and charged to the right voltage.
Travel & Outdoors
Light and compact, run from a power bank or solar panel, so your cells charge wherever the trip takes you.
Battery Enthusiasts
Set the current and cut-off voltage by hand, and read internal resistance to track how each cell is ageing.
COMPATIBLE BATTERIES
| TYPE | SIZES | WORKS |
| IMR / Li-ion / LiFePO4 | 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 | Yes |
| Ni-MH / Ni-Cd | AA, AAA, AAAA, C, D | Yes |
RECOMMENDED CABLE
Use a USB cable rated to carry the full 18W input so the charger reaches its top speed.TECHNICAL SPECIFICATIONS
| Charging bays | 2 (independent) |
| Input | DC 5V/2A, 9V/2A, 18W (MAX), QC 2.0 |
| Output voltage | 4.35V / 4.2V / 3.7V / 1.48V (±1%) |
| Output current (QC) | 3,000mA x1 (MAX), 2,000mA x2 (MAX) |
| Output current (standard) | 2,000mA x1 (MAX), 1,000mA x2 (MAX) |
| Total max output | 4,000mA |
| Charging modes | CC, CV and -dV/dt (auto) |
| Display | LCD: current, voltage, capacity, resistance, time |
| Body material | Fire-retardant PC |
| Dimensions | 152mm x 73mm x 40mm (5.98" x 2.87" x 1.57") |
| Weight | 157.7g (5.56 oz), cable not included |
| Download Instruction Manual (PDF) | |
FREQUENTLY ASKED QUESTIONS
Will it charge the batteries I already own?
If your cells are IMR, Li-ion, LiFePO4, Ni-MH or Ni-Cd, the answer is almost certainly yes. The UMS2 takes round Li-ion cells from a tiny 10440 up to a 26700, which covers 18650 and 21700, and it also charges AA, AAA, AAAA, C and D. It detects the chemistry and capacity on its own and sets the right voltage.
Can I charge both bays at 3,000mA at the same time?
The 3,000mA figure is the maximum for a single bay. With both bays in use the charger shares its 4,000mA total output, giving up to 2,000mA to each cell over a Quick Charge source. Charging one cell at a time is the way to reach the full 3,000mA single-bay speed.
What does the screen actually show me?
The LCD reports live charging current, battery voltage, charged capacity, internal resistance, elapsed time and the charging mode in use. Internal resistance is a useful health check, since a cell that reads high is on its way out. You can also set the current and cut-off voltage by hand when you want manual control.
What's In The Box
- 1x UMS2 Charger - intelligent two-bay USB charger
- 1x USB-C Cable - for connecting to your power source
Fast, smart, two-bay charging for every cell you carry.
GET YOUR UMS2 CHARGER NOWYou’re Backed by Our 60-Day Ironclad Guarantee
 |
 |
Try it for 60 days. If it’s not right for you, send it back.
We stand behind our gear. If you’re not happy with your purchase, just return the full package within 60 days and we’ll issue a full refund—no fuss, no forms, no hoops to jump through.
What Happens After You Order
- You’ll get an instant order confirmation email with your receipt.
- We’ll pack your order the next working day and send you a tracking number once it’s on the way.
- From the moment you order to the moment it reaches your hands, we’re here to keep you updated and supported.
When will I receive my gear?
- Singapore: Delivered to your doorstep in 4–6 working days.
- International: Arrive within 10–14 working days.
Returns and warranty
- Every product comes with a 1 to 3-year replacement warranty (depending on the item).
- If anything isn’t working right, just let us know. We’ll make it right.
FREE Gift with Purchase: Limited Edition Ember Shard Whistle
Spend $99 or more today, and we'll automatically include a limited-edition Glow-in-the-Dark Ember Shard Whistle when packing your order.
Charge it quickly under sunlight or your flashlight, and enjoy its subtle glow throughout the night—perfect for marking gear, emergency kits, or attaching to your bag.
Limited quantities. These will be swapped (at our discretion) to other gift items if shards are unavailable.
Products related to this item
Recently viewed
Get help choosing the perfect light for your task, and have it delivered on the same day!
If you can't find what you are looking for, or need delivery on a specific date, WhatsApp us below.