Little Bird
Smart Charger for 18650 4.2V Li-ion battery
A 4-slot smart charger for 18650 and other cylindrical Li-ion rechargeable batteries. Each slot operates independently, so you can charge batteries of differ...
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A 4-slot smart charger for 18650 and other cylindrical Li-ion rechargeable batteries. Each slot operates independently, so you can charge batteries of different sizes and charge levels simultaneously. USB powered for convenient use with any standard USB power source.
Built-in safety features automatically stop charging when batteries reach full capacity (4.23V cut-off), protecting against overcharging and extending battery lifespan. LED indicators show charging status at a glance — red for charging, green for fully charged.
Key Features
- 4 Independent Slots – Charge different batteries simultaneously
- Auto Cut-Off – Stops at 4.23V to prevent overcharging
- LED Status Indicators – Red (charging) / Green (fully charged) per slot
- USB Powered – DC 5V input, 1–2A via standard USB
- 1000mA Per Slot – DC 4.2V output for efficient charging
- Compact & Lightweight – 90 × 30 × 122mm, just 106g
Compatible Battery Types
- 18650, 18500, 18350
- 16650, 16340
- 14650, 14500
- 10440
Specifications
- Model – BH-042100-04U
- Input – DC 5V, 1–2A (USB)
- Output – DC 4.2V, 1000mA per slot
- Cut-Off Voltage – 4.23V
- Dimensions – 90 × 30 × 122mm
- Weight – 106g
Ideal For
- Charging 18650 batteries for torches, power banks, and electronics
- Maker and robotics projects using Li-ion cells
- Maintaining spare batteries for portable devices
Package Contents
- 1× 4-Slot Smart Li-ion Battery Charger
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
Find this product in
Power & Batteries
Related Tutorials
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