21V 2A Smart 18650 Li-ion Battery Charger – DC 5.5mm Plug

21V 2A Smart Lithium Battery Charger for 18650 & 18V Li-ion Battery Packs

Keep your 18650 lithium and 18V Li-ion battery packs fully charged and ready to go with this intelligent smart charger from Skerimte. Designed for versatility and safety, this compact charger features global compatibility (EU, US, UK, AU plug options) and a universal AC input range of 100V–240V — making it perfect for home, workshop, and travel use worldwide.

With a clean DC 5.5mm × 2.1mm output connector and a generous ~70cm cable length, it connects effortlessly to a wide range of battery packs. The smart charging circuitry automatically manages the charge cycle for optimal battery health, cutting off at the correct voltage to prevent overcharging.

Key Features

• Smart Charging Technology: Intelligent charge management automatically adjusts output for safe, efficient charging every time.
• Universal AC Input: Accepts 100V–240V, 50/60Hz — compatible with wall outlets around the world.
• Output Specs: DC 21V / 2A with a maximum output power of 42W for fast, reliable charging.
• Standard DC Connector: 5.5mm × 2.1mm output jack fits the majority of 18V/18650 battery pack housings.
• Generous Cable Length: ~70cm cable provides comfortable reach during charging.
• Multi-Plug Options: Available with EU, US, UK, or AU plug — order the version that suits your region.
• CE Certified: Meets CE safety standards for added peace of mind.
• No High-Concern Chemicals: Contains no restricted or high-concern chemical substances.

Technical Specifications

Compatible With

Designed for 18V Li-ion and 18650 lithium polymer battery packs using a standard DC 5.5mm × 2.1mm input port. Ideal for power tool battery packs, DIY electronics, portable power banks, and more. Always verify your battery pack's input voltage and connector size before use.

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What battery types is this 21V 2A charger compatible with?

A: This smart charger is designed for 18V Li-ion and 18650 lithium polymer battery packs that accept a DC 21V / 2A charge input via a standard 5.5mm × 2.1mm DC connector. Always confirm your battery pack's rated input voltage matches DC 21V before use.

Q: Can I use this charger in different countries?

A: Yes! The charger accepts a universal AC input of 100V–240V, 50/60Hz, making it compatible with wall outlets in North America, Europe, the UK, Australia, and most other regions. Simply select the correct plug type (EU, US, UK, or AU) when ordering.

Q: Does this charger stop automatically when the battery is full?

A: Yes. The intelligent smart charging circuitry monitors the battery's charge level and automatically cuts off current when the battery reaches full capacity, helping to maintain battery longevity and prevent overcharging.

Q: What is the output connector size for this charger?

A: The output connector is a standard DC barrel jack measuring 5.5mm (outer diameter) × 2.1mm (inner pin diameter), which is one of the most common connector sizes used on 18V Li-ion battery packs and DIY electronics projects.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.