2-Slot USB Li-ion Battery Charger for 14500 & 18650

Alasicka 2-Slot Smart USB Li-ion Battery Charger for 14500 & 18650 Batteries

Keep your rechargeable lithium-ion batteries fully charged and ready with the Alasicka Universal 2-Slot Smart LED Battery Charger. Designed for 3.7–4.2V Li-ion cells including popular 14500 and 18650 battery sizes, this compact USB charger is perfect for flashlights, cameras, vapes, portable fans, and more. CE-certified for safety and built with intelligent charging technology. Made in China.

Key Features

• Universal Compatibility: Telescopic spring-loaded slots accommodate 14500 and 18650 Li-ion rechargeable batteries (3.7–4.2V). Charge one or two batteries at a time — independent channels mean each slot works on its own.
• LED Status Indicator: Red LED light signals active charging; turns green when your battery is fully charged — no guesswork needed.
• Three-Stage Intelligent Charging: Automatically manages charging current across three stages (trickle → constant current → constant voltage) to maximize battery lifespan and charging efficiency.
• Overcharge Protection: Automatically stops charging when the battery reaches full capacity, preventing overcharging and heat buildup.
• Anti-Reverse Connection: Accidentally inserted a battery backwards? No problem — the charger detects reverse polarity and powers off instantly to prevent short circuits.
• High-Temperature Resistant Materials: Constructed from heat-dissipating materials to stay cool during extended charging sessions.
• USB Powered (5V DC Input): Plug into any USB power source — wall adapters, laptop USB ports, power banks, or car USB chargers — for ultimate charging flexibility.
• Quick Charge Capable: Recharging current of 1–3A (1000 mA) for efficient, faster top-ups.
• CE Certified: Professionally tested and certified to meet safety and quality standards.

Technical Specifications

• Compatible Batteries: 18650 / 14500 Li-ion (3.7–4.2V)
• Input: 5V DC (USB)
• Output Voltage: 4.2V
• Output Power: ≤37.5W
• Recharging Current: 1–3A / 1000 mA
• Discharge Current: 500 mA
• Slots: 2 (independent channels)
• Display: LED indicator (Red = Charging, Green = Full)
• Certification: CE
• Origin: Made in China

What's in the Box

• 1× Alasicka USB 2-Slot Li-ion Battery Charger

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: Can this charger charge 1.2V nickel-cadmium (NiCd) or nickel-metal hydride (NiMH) batteries?

A: No. This charger is designed specifically for 3.7–4.2V Li-ion rechargeable batteries such as the 14500 and 18650 formats. It is not compatible with 1.2V NiCd or NiMH batteries.

Q: Can I charge disposable (single-use) batteries with this charger?

A: No. Only rechargeable lithium-ion batteries should be used. Attempting to charge disposable batteries is unsafe and not supported by this device.

Q: Can I charge just one battery at a time, or do I need to insert two?

A: You can charge either one or two batteries at a time. Each slot operates as an independent channel, so inserting a single battery into either slot works perfectly fine.

Q: What USB power sources are compatible with this charger?

A: The charger accepts any standard 5V DC USB power source — including wall adapters, computer USB ports, power banks, and in-car USB chargers — giving you maximum flexibility wherever you are.

Q: How do I know when my battery is fully charged?

A: The LED indicator on the charger glows red while charging is in progress and switches to green once the battery is fully charged. The charger will also automatically stop supplying current to prevent overcharging.

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.