Rechargeable Li‑ion Battery XTAR 21700‑4900 3.7V 4900mAh — 21700, 2.17 cm × 74.8 mm

Rechargeable XTAR 21700-4900 is a high-capacity 21700 Li‑ion cell with a nominal voltage of 3.7 V and a rated capacity of 4900 mAh. The battery is supplied as a single cell with physical dimensions of 2.17 cm diameter and 74.8 mm height, intended for use in devices that require large-capacity cylindrical cells.

Advantages

The XTAR 21700-4900 offers a large 4900 mAh capacity in the 21700 format, providing extended runtime compared with smaller cylindrical cells. Its rechargeable lithium‑ion chemistry supports repeated charge cycles and is suitable for high-drain portable devices. The cell’s standard 21700 dimensions allow compatibility with devices and holders designed for this size.

Suitable for

• High-capacity flashlights
• Power banks and portable chargers
• High-drain electronic devices and tools

Key specifications

• Cell type: Rechargeable Lithium‑Ion (Li‑Ion)
• Nominal voltage: 3.7 V
• Rated capacity: 4900 mAh
• Format: 21700 cylindrical cell
• Dimensions: diameter 2.17 cm, height 74.8 mm
• Quantity: 1 cell included

How to use

Use the XTAR 21700-4900 in devices that accept 21700 cylindrical Li‑ion cells. Charge the cell only with chargers compatible with rechargeable lithium‑ion batteries and follow the charger manufacturer’s instructions. Insert the cell according to the device’s polarity markings and ensure correct seating in the battery compartment or holder before powering the device.

Usage recommendations

Do not expose rechargeable batteries to direct heat. Use compatible chargers, avoid short circuits, and store batteries in a cool, dry place when not in use.