Charger XTAR BC4 1‑slot Li‑ion battery charger for single rechargeable cells

XTAR BC4 is a single‑slot charger designed specifically for Li‑ion rechargeable cells. The compact unit accommodates one cell at a time and provides a straightforward charging method for maintaining battery capacity and restoring charge. Its simple interface and portable size make it suitable for use with flashlight batteries, small electronics cells and power bank cells where individual charging is required.

Advantages

The charger offers a compact footprint and single‑cell focus that minimizes space and power consumption while simplifying the charging process. Built with standard Li‑ion charging logic, it delivers regulated current appropriate for a range of cell capacities and includes basic safety features to prevent overcharging. The device is easy to carry and operate, making it convenient for both occasional maintenance charging and routine use by hobbyists and professionals.

Suitable for

• Charging individual Li‑ion cells used in flashlights and torches
• Maintaining capacity of power bank cells during storage or repair
• Charging single cells from DIY electronics and hobby projects
• Testing and topping up batteries before installation

Key specifications

• Single charging slot for one cylindrical or flat Li‑ion cell
• Compatibility with common Li‑ion cell sizes and chemistries (standard 3.6–3.7 V nominal cells)
• Compact and lightweight housing for portable use
• Regulated charging current suitable for everyday cell capacities
• LED indicator for charge status
• Built‑in basic safety protections against overcharge and short circuit

How to use

Insert a single Li‑ion rechargeable cell into the slot following the polarity markings. Connect the charger to a compatible power source using the provided input method. Observe the LED indicator to confirm charging has started; the indicator changes state when the cell reaches full charge. After the charger signals completion, remove the cell and allow it to rest briefly before use. Do not attempt to charge damaged cells and always confirm the cell type and nominal voltage before charging.

Usage recommendations

Use the charger on a stable, non‑flammable surface in a well‑ventilated area. Charge cells within their recommended voltage and current limits, and avoid leaving batteries connected for extended periods once charging is complete. Regularly inspect cells for physical damage and discontinue charging any cell that shows swelling, leakage or abnormal heat.