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