A two-bay USB-C charger you can run off your power bank, anywhere.
Top up your 18650, 21700, AA and more from a power bank, laptop or wall adapter, with up to 3A into a single slot.
- 2 independent slots, charge up to 2 batteries at once
- Up to 3,000mA into one slot in Fast Charge Mode
- USB-C input at 18W, with QC and PD fast-charge support
- Works with Li-ion, IMR, Ni-MH and Ni-Cd cells from 10440 to 26700, plus AA, AAA, C and D
- Powered by power banks, solar panels, laptops or USB wall adapters
- Per-slot LEDs show charge level and mode at a glance
- 120.4g and 148mm long, sized to travel in a pocket of your kit
Up to 3A into a single battery.
In Fast Charge Mode the Ci2 puts up to 3,000mA into one slot, so a high-drain 21700 is ready again in a fraction of the time a basic charger takes. Nitecore measured roughly 35 minutes to take a 3,500mAh cell from 30 percent to 80 percent.
Charge two cells together and each slot runs at up to 1,500mA, so a pair of 18650s tops up while you pack the rest of your gear.
USB-C in, so it charges wherever you do.
The single USB-C port takes power from almost anything with a USB output. Run it off a 20,000mAh power bank at camp, your laptop on a train, a wall adapter at the hotel, or a folding solar panel in the field.
The plug is reversible, so it goes in the right way every time. One small charger covers home use and travel, instead of leaving a wall-only unit behind.
Fast Charge Mode from QC and PD sources.
Plug the Ci2 into a Quick Charge or Power Delivery adapter or power bank and it steps up to Fast Charge Mode, reaching that full 3,000mA into a single slot. The 18W input draws from 5V, 9V or 12V sources, so it makes the most of the chargers you already carry.
One charger for almost every cell you own.
The Ci2 handles Li-ion and IMR cells from the tiny 10440 up to the 26700, alongside Ni-MH and Ni-Cd in AA, AAA, AAAA, C and D. So your flashlight 21700s, headlamp 18650s and the AAs from a remote all charge in the same unit.
A charging program tuned for IMR cells watches the whole cycle and holds the cut-off voltage within safe limits, which helps your batteries last longer.
Each slot charges on its own terms.
The two slots are controlled independently, so you can mix a 21700 in one and a 14500 in the other and each gets the right treatment. The Ci2 detects the battery, then picks between three charging modes, CC, CV and -dV/dt, to match the chemistry and capacity.
Slot your cells in any combination and it sorts out the voltage and current for each one, so you do not have to.
A quick look tells you where each cell stands.
Every slot has its own row of indicator LEDs. A constant red light means the slot is in Fast Charge Mode, and the green lights show roughly how full the battery is, one green for about 30 percent, two for about 80 percent and three for 100 percent.
So a glance across the unit tells you which cells are still working and which are ready to go back in your gear.
Built to charge safely, trip after trip.
Cooling fins along the body pull heat away as the cells charge, and the casing is moulded from durable, fire-retardant PC that shrugs off knocks and grit on the move. Reverse-polarity and short-circuit protection guard against a cell slotted the wrong way.
Overtime protection ends the charge if a cycle runs long, and over-discharged cells can be woken up and brought back to a usable state.
WHY THE Ci2 OVER A BASIC BATTERY CHARGER
Charges from a power bank
USB-C input runs off power banks, laptops and solar panels. A mains-only charger stays plugged into a wall at home.
Up to 3A fast charging
QC and PD input unlocks 3,000mA into a single slot. Many basic chargers trickle at a few hundred milliamps.
One unit, many chemistries
Li-ion, IMR, Ni-MH and Ni-Cd from 10440 to D in the same two slots. Cheap chargers usually lock you to one size.
Independent, intelligent slots
Each slot detects the cell and picks its own mode, so mismatched batteries charge correctly side by side.
WHERE THE Ci2 EARNS ITS PLACE
Travel
One small charger powered by your existing USB adapter or power bank, so you leave the bulky wall unit at home.
Everyday Carry
Keep the 18650s and 21700s for your flashlights and gear topped up at your desk over USB-C.
Field & Outdoors
Run it off a folding solar panel or a power bank at camp to keep two cells charged away from the grid.
Backup & Prep
A single charger that takes nearly every cell in the house, from AA remotes to C and D lanterns.
CHARGING CURRENT
| MODE | 1 SLOT | 2 SLOTS |
| Fast Charge | 3,000mA max | 1,500mA max each |
| Standard | 2,000mA max | 1,000mA max each |
COMPATIBLE BATTERIES
| IMR / Li-ion | 10440, 14500, 14650, 16340 (RCR123), 16500, 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 |
| Ni-MH / Ni-Cd | AA, AAA, AAAA, C, D |
TECHNICAL SPECIFICATIONS
| Slots | 2 (independent) |
| USB-C Input | 5V⁃2A / 9V⁃2A / 12V⁃1.5A, 18W (max) |
| Fast Charge Input | QC and PD supported |
| Output Voltage | 4.2V±1% (Li-ion) / 1.48V±1% (Ni-MH/Ni-Cd) |
| Max Single-Slot Current | 3,000mA |
| Charging Modes | CC, CV and -dV/dt (auto-selected) |
| Indicators | Per-slot LEDs (red Fast Charge, 3 green charge level) |
| Casing | Fire-retardant PC with cooling fins |
| Dimensions | 148mm x 65mm x 37mm (5.83" x 2.56" x 1.46") |
| Weight | 120.4g (4.25 oz) |
| Download Instruction Manual (PDF) | |
FREQUENTLY ASKED QUESTIONS
Can I run the Ci2 off a power bank?
Yes. The Ci2 is powered entirely through its USB-C port, so any power bank, laptop, USB wall adapter or USB solar panel can run it. For the full 3,000mA Fast Charge Mode, use a source that supports Quick Charge or Power Delivery.
Which batteries fit the Ci2?
It charges Li-ion and IMR cells from 10440 up to 26700, which covers common sizes like 14500, 16340, 18650 and 21700, as well as Ni-MH and Ni-Cd in AA, AAA, AAAA, C and D. The two adjustable slots take different sizes at the same time.
Can I charge two batteries at once?
Yes. Both slots work independently and at the same time. Charging one cell gives it up to 3,000mA, and charging two together runs each slot at up to 1,500mA in Fast Charge Mode.
What's In The Box
- 1x Nitecore Ci2 Charger - intelligent USB-C dual-slot charger
A USB-C cable is not included. Use any USB-C cable rated for up to 18W charging.
Fast, flexible charging for almost every cell you carry.
GET YOUR Ci2 CHARGER NOWYou’re Backed by Our 60-Day Ironclad Guarantee
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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.
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