Rechargeable Li‑Ion Battery Samsung INR21700-50E 3.6V 4900mAh (21700)

Samsung INR21700-50E is a rechargeable lithium‑ion cylindrical cell with a nominal voltage of 3.6V and a rated capacity of 4900mAh in the 21700 format. The cell is intended for high‑capacity energy storage where compact size and extended run time are required. It suits devices that accept 21700 cells and that incorporate appropriate charging and protection circuitry to ensure safe operation. The chemistry and cell design prioritise energy density within a standard 21700 form factor for portable power applications.

Advantages

The Samsung INR21700-50E offers high nominal capacity and stable nominal voltage, enabling longer runtime compared with lower‑capacity cylindrical cells of the same size. Its 21700 format provides a balance of compactness and energy storage, making it suitable for applications where space and weight are important. When used with proper chargers and protective electronics, the cell delivers consistent discharge performance and good cycle life for rechargeable Li‑Ion chemistry.

Suitable for (tasks / use cases)

• High‑capacity flashlights and portable lighting
• Power banks and portable battery packs
• Electric tools and small electric vehicles that accept 21700 cells
• Energy storage modules and DIY battery assemblies with appropriate protection
• Hobby electronics and devices requiring long runtime

Key specifications

• Cell type: cylindrical Li‑Ion (21700)
• Nominal voltage: 3.6 V
• Rated capacity: 4900 mAh
• Typical use: high‑capacity energy storage for portable devices
• Physical format: 21700 (diameter ~21 mm, length ~70 mm)

How to use

Install the Samsung INR21700-50E only in devices designed to accept 21700 cells and that include appropriate battery management, charge control and protection against over‑charge, over‑discharge and short circuit conditions. Charge the cell with a compatible Li‑Ion charger following the manufacturer’s charging profile and current limits recommended for Li‑Ion chemistry. Avoid exposing the cell to high temperatures, mechanical damage or moisture. For multi‑cell assemblies, use matched cells and a proper battery management system (BMS) to maintain balance and safety.

Usage recommendations

Use a charger and protective circuitry matched to Li‑Ion chemistry and the cell’s voltage range. Store cells in a cool, dry place at partial state of charge for extended storage. Inspect cells regularly for signs of damage and replace any cell that shows deformation, leakage or abnormal heating. Do not attempt to open, crush or incinerate the cell.