XTAR MC4S Vape Battery Charger
by XTAR
No reviews yet — be the firstXTAR MC4S compact four-slot charger handles 18650, 21700 and smaller Li-ion cells via USB. LED charge indicators. Lightweight, travel-friendly design. £7.99.
£7.99sold individually · inc VAT
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Written and fact-checked by the VapeCity team · Updated June 2026
XTAR MC4S: four-slot USB Li-ion charger for vapers who carry spare batteries
The XTAR MC4S is a four-slot Li-ion charger built around portability. Where most four-slot chargers are desktop units with large housings and mains connections, the MC4S draws power from a standard USB port and folds into a compact, lightweight form that fits comfortably in a bag or kit pouch. At £7.99 it is the most affordable option in the XTAR vape charger range at VapeCity, and the only one in the line-up with four slots.
The trade-off for its compact size is simplicity. The MC4S uses LED indicators rather than an LCD voltage display: a red light shows charging in progress, green shows completion. There is no real-time voltage monitoring. For vapers who want to track cell health numerically, the VC2 or VC2SL are better options. But for someone who runs a dual-battery mod, carries two spare sets of 18650s, and wants to charge all four cells before heading out, the MC4S handles that task efficiently and cheaply.
- Four independent charging slots let you top up a full set of spare cells in a single charge session, ideal for vapers who carry two or three spare 18650s.
- Ultra-compact form factor: the MC4S is substantially smaller and lighter than four-slot competitors, making it a practical travel charger for overnight trips or festivals.
- Simple LED indicator system shows red while charging and green when each cell reaches full charge; no screen to break or battery to replace.
- USB-powered from any standard 5V source: wall adapters, laptop ports, power banks. No proprietary power brick needed.
- Compatible with 18650, 20700, 21700 and smaller cylindrical Li-ion cells including 16340 and 14500 formats.
On this page
Who is the XTAR MC4S for?
The MC4S suits vapers with high battery turnover who prioritise throughput over monitoring. If you run a dual-battery mod all day, you might cycle through two or three pairs of 18650s. A two-slot charger means doing two separate charge sessions to top up four cells; the MC4S does all four in one. For a travel kit, the USB power and compact footprint mean one fewer power adapter needed in your bag.
It is less suited to vapers who want to closely monitor cell voltage over time. The LED-only display gives no real-time readout. For cell health monitoring, the VC2 or VC2SL with their LCD screens are the better choice. But for pure charge-and-go convenience at a low price, the MC4S earns its place.
Which batteries fit the XTAR MC4S?
The four bays accommodate cylindrical Li-ion cells from 10440 up to 21700 in the standard format, and 26650 in some bay configurations. The most common vape cells (18650, 20700 and 21700) all fit correctly. The spring contacts adjust to cell length automatically.
Cells charge at 0.25A to 0.5A per slot depending on the source current available. Charge times are longer than the single-slot VC2SL; this is the expected trade-off when charging four cells from a shared USB source. A 3,000mAh 18650 from flat takes around four to six hours depending on the USB adapter used.
Using the MC4S as a travel charger
The MC4S is genuinely small enough to replace a two-slot charger in a travel bag while adding two extra capacity slots. Its USB input means a single 5V/2A or 5V/3A USB wall plug powers all four slots, and it shares the same charging standard as your phone, so one adapter in the socket handles both.
For travel compliance, the batteries themselves must be removed from the charger and carried separately in a fireproof battery case in carry-on luggage per airline Li-ion regulations. The charger itself passes through as a standard USB device with no airline restrictions.
XTAR MC4S verdict
At £7.99 for a four-slot charger with USB power and full Li-ion safety protection, the MC4S is hard to beat on value. The simplicity of LED indicators is a genuine limitation for vapers who want voltage data, but for straightforward bulk charging of 18650 spare sets, it does the job efficiently. Pair it with a quality 5V/3A wall adapter for the best charge speeds across all four slots.
The good
- Four slots for bulk charging in a single session.
- Compact, lightweight: the most portable XTAR charger in the range.
- USB-powered from any standard 5V adapter or power bank.
- Affordable at £7.99.
The catch
- LED-only indicators with no voltage readout.
- Slower per-slot charge rate when all four bays are in use.
- No individual slot amperage display.
Specifications
| Slots | 4 |
|---|---|
| Input | USB 5V |
| Charge current | 0.25--0.5A per slot |
| Cut-off voltage | 4.20V ±1% |
| Compatible cells | 10440, 14500, 16340, 18650, 20700, 21700 Li-ion |
| Display | LED indicators (red/green) |
| Protections | Overcharge, reverse polarity, short circuit |
| Brand | XTAR |
| Price | £7.99 |
Frequently asked questions
Can the XTAR MC4S charge four batteries at the same time?
Yes. All four slots operate simultaneously from a single USB source. The charge current per slot is shared, so a higher-rated USB adapter (5V/2A or above) gives better speeds across all four.
Does the XTAR MC4S work from a power bank?
Yes. Any power bank with a standard USB-A output at 5V/1A or above powers the MC4S correctly. At 5V/2A you get better per-slot current.
How do I know when the batteries are fully charged on the MC4S?
Each slot has an LED indicator. Red means charging is in progress. Green means the cell has reached 4.2V and the charge cycle is complete.
Is the XTAR MC4S suitable for 21700 batteries?
Yes, the MC4S bays accommodate 21700 cells alongside 18650 and smaller formats.
What is the difference between the XTAR MC4S and the VC4?
The VC4 is a larger four-slot desktop charger with an LCD display showing real-time voltage, 1A per slot charge current and a mains-to-USB adapter. The MC4S is a compact travel unit with simpler LED indicators and USB power only. The VC4 charges faster and gives more data; the MC4S is smaller and cheaper.
Delivery
| Standard UK delivery2–3 working days | £2.99 |
|---|---|
| Next-day deliveryorder before 3pm, Mon–Fri | £5.99 |
| Orders over £40free standard UK delivery | Free |
Order before 3pm and we dispatch the same working day. Everything ships in plain, discreet packaging from UK stock, and it’s all TPD-compliant.
Returns
You have a 14-day right to cancel online orders. Because e-liquids, pods, disposables and pouches are sealed for hygiene, change-of-mind returns are accepted only when the item is unused and in its original, unopened packaging — opened or used products can’t be refunded. Anything faulty, damaged or incorrectly supplied is fully covered under the Consumer Rights Act, return postage on us.
Full details on our returns & refund policy page.
Customer reviews
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