Name: 21V 1A Lithium Battery Charger | 5.5x2.1mm DC | Fast Shipping
Brand: Sun Cheong Computer Company Limited
SKU: 21PA000633
Price: 85.0 HKD
Availability: InStock

Short Product Description

Don't let a dead battery halt your projects. This highly reliable 21V 1A Lithium-Ion Battery Charger delivers safe, consistent power to your power tools, DIY electronics, and custom 5-cell (5S) battery packs. Featuring a universal 5.5x2.1mm DC barrel plug and built-in smart protection against overcharging, it ensures your devices are always ready to perform. Safe, efficient, and built to last.

Key Features

Precision 21V 1A Output: Delivers the exact voltage needed to safely charge 5S lithium-ion battery packs without degrading cell capacity.
Standard 5.5x2.1mm DC Connector: Fits seamlessly into thousands of standard electronic devices, power tools, and custom DIY projects.
Smart Overcharge Protection: Built-in circuitry automatically stops supplying heavy current when the battery is full, preventing overheating and fire hazards.
Universal 100-240V AC Input: Travel-friendly wide voltage range allows the charger to operate safely on various power grids worldwide.
Standard UK 3-Pin Plug: Ready for immediate use in standard wall sockets without the need for bulky or unsafe adapters.

Full Product Description

Reliable Power for Your High-Drain Devices

When you are working on a crucial DIY project or need your power tools ready for the job, a dependable power supply is non-negotiable. Our 21V 1A Lithium Battery Charger is engineered to provide a steady and efficient charge to all compatible 21V lithium-ion devices. Unlike cheap, unbranded chargers that degrade battery health, this adapter ensures a smooth power delivery curve to extend the lifespan of your lithium cells.

Built for Safety and Battery Longevity

Lithium-ion batteries require precise charging parameters. This charger outputs exactly 21V, which is the optimal full-charge voltage for a standard 5-cell (5S) 18V/21V lithium battery pack. Equipped with smart IC technology, it automatically monitors the charge state, preventing overcharging, short-circuiting, and overheating. This means you can plug in your device and walk away with total peace of mind.

Universal 5.5mm x 2.1mm Compatibility

Finding the right connector can be a headache. That is why this charger utilizes the industry-standard 5.5mm (outer diameter) x 2.1mm (inner diameter) DC barrel jack. Whether you are powering custom robotics, replacing a lost drill charger, or working on STEM educational kits, this versatile connector fits a massive range of modern electronics and hardware tools.

Technical Specifications

Model: CGW‑2110
Battery compatibility: Lithium‑Ion (Li‑ion)
Input voltage: 100–240 V AC, 50/60 Hz
Output voltage: 21 V DC
Output current: 1 A (1000 mA)
DC connector size: 5.5 mm (OD) × 2.1 mm (ID)
Plug type: UK Type G (3‑pin)
Certifications: CE, double insulated

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Q: Will this charger work for my 18V power drill?
A: Yes, in most cases. Many "18V" lithium-ion battery packs are composed of 5 cells. They have a nominal voltage of 18V but require a peak charging voltage of 21V (4.2V per cell). Always check your tool's manual, but 21V is the standard charging voltage for these packs.

Q: How do I know if the 5.5x2.1mm plug will fit my device?
A: 5.5x2.1mm is one of the most common DC plug sizes. You can measure your device's charging port with calipers (5.5mm across the hole, 2.1mm for the center pin), or check the manufacturer's specifications of your device.

Q: Is it safe to leave my battery plugged in overnight?
A: While this charger features built-in protections against over-voltage and short-circuiting, it is generally best practice for lithium-ion safety to unplug the device once it is fully charged.

Target Users / Applications

DIY Electronics Hobbyists & Makers: For custom robotics, Arduino/Raspberry Pi projects utilizing 5S Li-ion packs.
Handymen & Professionals: Replacing lost or broken chargers for 18V/21V cordless power tools.
STEM Educators & Students: Reliable power supplies for classroom science and engineering projects.
General Home Users: Powering compatible home electronics, LED lighting arrays, or CCTV equipment.