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Description - Xtar SC2 External USB Battery Charger
The XTAR SC2 is a compact, dual-bay lithium-ion charger built for vapers, torch users and anyone who relies on external rechargeable cells. Part of the XTAR collection, it combines QC3.0 fast charging with a practical set of diagnostic tools, giving you real visibility into your cells' condition over time. It fits the four most common cell sizes used in vaping: 18650, 20700, 21700 and 26650. Available now from our full battery chargers range, the SC2 ships with a 1-year warranty and fast UK delivery.
Whether you need a rapid top-up before heading out or a careful overnight charge, the SC2 gives you the flexibility to do both.
Introducing the XTAR SC2
Experienced vapers running external-battery mods need a charger that keeps pace with their setup. The SC2 delivers up to 3A on a single bay or 2A per bay with both slots in use, provided you're using a QC3.0-compatible USB adapter. It also carries a built-in internal resistance checker and full capacity test, two features that most chargers at this price point simply omit.
Those diagnostic tools aren't cosmetic additions. Internal resistance (IR) is a practical measure of how healthy a cell actually is. As a cell ages, its IR rises, it delivers less peak current and generates more heat under load. Having that reading available each time you charge means you're not guessing when a cell is due for retirement. For vapers running high-drain cells in a regulated mod, that matters.
The SC2 is the right pick for everyday vapers and enthusiasts running single or dual external-battery devices who want fast, reliable charging backed by genuine cell-health monitoring.
Why Choose the XTAR SC2?
- Charger type: Dual-bay external lithium-ion charger, compact and travel-ready
- Charging speed (QC3.0 adapter): Up to 3A on one bay; 2A per bay when both slots are occupied
- Charging speed (standard USB): 1A single bay, 0.5A per bay across both slots - useful for slower, cell-friendly top-ups
- Input: Micro-USB with QC3.0 compatibility (note: QC3.0 adapter not included in the box)
- Diagnostic tools: Built-in internal resistance checker and full capacity test to monitor cell health
- Cell compatibility: 18650, 20700, 21700 and 26650 Li-ion cells, including many protected 20700 and 21700 variants
- Protections: Over-charge, reverse polarity, short-circuit and temperature safeguards as standard
- Additional features: 0V activation to revive over-discharged cells, soft-start to gradually ramp current at the start of each cycle, and high-precision cut-off
- Charging indicators: LED progress display shows charge status at a glance
- Best for: Vapers running single or dual external-battery mods, or anyone maintaining a rotation of rechargeable cells
The combination of fast QC3.0 output and built-in diagnostics means you're not just topping cells up. You're keeping a closer eye on their condition each time you charge.
Compatibility and Performance
Compatible cells: 18650, 20700, 21700 and 26650 lithium-ion at 3.6V/3.7V nominal voltage. Many protected 20700 and 21700 cells are also supported.
Not compatible with: NiMH, NiCd or LiFePO4 chemistry. Li-ion (3.6V/3.7V) cells only.
The SC2 is designed for vapers using external-battery box mods, including dual-battery mods and single-battery mods. Browse compatible 18650 batteries and 21700 batteries in our curated battery range.
One detail worth understanding before you buy: the SC2's full charging performance requires a QC3.0-compatible USB adapter, and that adapter is not included in the box. Connected to a standard USB source, such as a laptop port or basic wall plug, the charger defaults to 1A single bay or 0.5A per bay across both slots. To unlock the 3A single-bay or 2A dual-bay output, you'll need an adapter rated for QC3.0.
How the SC2 handles QC3.0 charging: when a QC3.0 adapter is connected and a single cell is inserted, the charger tests the cell's internal resistance first. If resistance is low enough to indicate a healthy cell, it charges at 3A. If not, it falls back to 2A. With two cells inserted simultaneously, both charge at 2A regardless of resistance readings.
Buying your cells and charger from the same place makes it easier to confirm compatibility upfront and keeps everything running as it should.
XTAR SC2 Highlights
The SC2 earns its place in any external-battery setup through a combination of charging speed, diagnostic capability and multi-layer protection.
- Fast QC3.0 charging: up to 3A single bay with a compatible adapter
- Internal resistance checker for ongoing cell health monitoring
- Full capacity test to confirm a cell's actual usable capacity
- 0V activation: capable of reviving cells that have dropped below safe operating voltage
- Soft-start charging: current ramps gradually at the start of each cycle to reduce stress on the cell
- High-precision cut-off: charge terminates accurately to prevent overcharging
- Multi-layer safety: over-charge, reverse polarity, temperature and short-circuit protection built in
- Compact dimensions: 105mm x 53mm x 27mm, light enough to travel with
These features work together to give you fast, consistent charges while actively prolonging the working life of your cells.
Box Contents
What's in the box:
- 1 x XTAR SC2 Dual-Bay Charger
- 1 x Micro-USB Cable
- 1 x XTAR Warranty Card
A QC3.0 USB adapter is required for full 3A single-bay or 2A dual-bay fast charging but is not included. A standard phone charger or laptop port will work, but output will be limited to 1A/0.5A. If you don't already own a QC3.0 adapter, factor that into your purchase.
Order the XTAR SC2 external battery charger from Vaping 101 and get same-day dispatch on orders placed before the daily cut-off, with tracked delivery options including next-day courier. Free delivery applies on orders over £50. The SC2 carries a full 1-year warranty, and our 14-day returns window means you're covered if anything is wrong on arrival. We price-match against any genuine UK retailer. If you're also stocking up on cells, our 18650 batteries and 21700 batteries ship in the same order, saving on delivery.
Xtar SC2 External USB Battery Charger Reviews
Warranty
Unlike many other vape stores, Vaping 101 fully complies with the Law and offer a full 1 year warranty as required by Law. Please see HERE for full clarification on UK Law on Consumer Goods.
Delivery Of Xtar SC2 External USB Battery Charger
- All orders are sent in discreet packaging.
- Delivery is free for all orders over £50. Otherwise, delivery is £3 to £12 depending on the service you plan to purchase.
- You can return your product up to 14 days after receiving your order. Please make sure that the products are not used or damaged.
UK Shipping
Service Overview: Reliable tracked delivery service.
Delivery Time: 2 to 4 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
- NOT GUARANTEED SERVICE
Cost: £3.00 (Free over £50)
Service Overview: Fast, door-to-door courier service.
Delivery Time: Next day for most UK postcodes. View postcode exclusions
Key Features:
- Full end-to-end tracking with live updates.
- Same-day dispatch Monday to Friday for orders placed before 1:00 PM (excluding Bank Holidays).
- Deliveries made on weekdays (some areas deliver Saturday).
- Signature required on delivery.
- Battery Restrictions: None: DPD imposes no additional restrictions on batteries.
- NOT GUARANTEED SERVICE
Cost: £3.50 (Free over £50)
Service Overview: Parcels are delivered to a nearby DPD Pickup Point or Drop-Point for customer collection.
Delivery Time: Next day for most UK postcodes. View postcode exclusions
Key Features:
- Notifications sent via email/SMS when parcel is ready for collection.
- No signature required—customer collects in person.
- Ideal if you’re not available at home for doorstep delivery.
- Battery Restrictions: None: DPD imposes no additional restrictions on batteries.
- NOT GUARANTEED SERVICE
Cost: £3.50 (Free over £50)
Service Overview: Reliable standard delivery service.
Delivery Time: 2 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
Cost: Price Based On Address
Service Overview: Faster tracked delivery service.
Delivery Time: Up to 1 to 2 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
- NOT GUARANTEED SERVICE
Cost: £4.00
Service Overview: A cost-effective express service for less time-sensitive deliveries.
Delivery Time: Next business day delivery by the end of the day to most UK destinations.
Key Features:
- Lower-cost option compared to UPS Express®.
- Includes tracking and proof of delivery.
- Suitable for urgent but not time-critical shipments.
Cost: Price Based On Address
Service Overview: Guaranteed next-day delivery service.
Delivery Time: Next day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
Cost: £9.00
Service Overview: A time-definite delivery service for urgent shipments.
Delivery Time: Next business day delivery by 10:30 AM or 12:00 PM to most UK locations.
Key Features:
- Ideal for time-critical shipments.
- Includes tracking and proof of delivery.
- Money-back guarantee if the delivery commitment is not met.
Cost: Price Based On Address
International Shipping
Delivery Time: 3-10 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- NOT GUARANTEED SERVICE
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Weight + Address
Delivery Time: 3-10 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- NOT GUARANTEED SERVICE
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Weight + Address
Delivery Time: 2-4 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: Next Business Day EU.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: Next Business Day EU By 10:30am.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: 2 Business Day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: 1-2 Business Day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Xtar SC2 External USB Battery Charger FAQ
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New to vaping or you're not sure where to start?
Don’t worry vaping might seem a bit confusing at first, but it really doesn’t need to be. If you’re unsure where to start or just want things explained clearly, we’ve put together a set of simple guides to help you understand the basics. From choosing the right vape kit to looking after your vape and learning the different ways to vape, everything’s covered in plain language.
We also have helpful videos from our reviewer, Andrew, who walks you through each topic and products shows you exactly how it all works.
If you need any extra help, our friendly support team is here 7 days a week via live chat or give us a call on 01224 032542 and we’ll be happy to assist. You can also reach us through Contact Us.
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