21700A 5000mAh Li-Ion Rechargeable Battery (Made in Japan)

Detailed Product Description

Power compatible devices with longer runtime using the 21700A 5000mAh Lithium-Ion Rechargeable Battery. Built in the popular 21700 cylindrical size, this battery offers higher capacity than many standard rechargeable cells, making it useful for demanding applications where stable and long-lasting power is important.

This battery is commonly listed with 5000mAh capacity, 3.7V nominal voltage, and 4.2V fully charged voltage. Its 21mm diameter and 70mm length make it suitable for devices designed specifically for 21700-size cells. It is often used in high-lumen flashlights, portable power projects, power banks, cordless tools, and custom battery pack applications.

The 21700A cell is commonly described as a lithium-ion rechargeable battery with a cylindrical shape and flat top design. It is also commonly listed as an unprotected cell, which means it should be used only with compatible devices or proper battery management systems. For custom packs, professional handling, correct polarity, proper charging equipment, and safety precautions are strongly recommended.

For Bangladesh customers looking for a high-capacity rechargeable 21700 battery, this model is a practical choice for compatible electronics, DIY projects, and replacement battery needs. Always confirm device compatibility, voltage requirement, charging method, and protection requirements before purchase.

Key Features

• Brand: Generic or No Brand
• Model: 21700A
• Product type: Lithium-ion rechargeable battery
• Battery size: 21700
• Capacity: 5000mAh
• Chemistry: Lithium-Ion (Li-ion)
• Nominal voltage: 3.7V
• Fully charged voltage: 4.2V
• Shape: Cylindrical
• Size: 21mm diameter × 70mm length
• Design: Commonly listed as flat top
• Protection type: Commonly listed as unprotected
• Suitable for compatible flashlights, power banks, power tools, DIY packs, and electronic projects
• Professional handling recommended for pack building and high-drain applications

Customer Benefits

• 5000mAh capacity supports longer device runtime
• Rechargeable design helps reduce repeated battery purchases
• 21700 size offers high energy storage in a compact cylindrical form
• Useful for high-drain compatible electronics
• Suitable for DIY users and technicians who need 21700 cells
• Can be used in compatible power projects with proper protection circuitry
• Practical option for flashlight, tool, and portable power applications

Suitable Use Cases

• High-lumen flashlights
• Compatible power banks
• Cordless power tools
• DIY battery packs with proper BMS
• Portable power projects
• Electronic repair and replacement work
• Rechargeable battery projects
• Compatible 21700 battery devices

Packaging Contents, if available

• 1 × 21700A 5000mAh Li-Ion Rechargeable Battery

Safety Note

This battery is commonly listed as an unprotected lithium-ion cell. Use only with compatible devices, correct chargers, and proper battery management protection where required. Do not short-circuit, puncture, overcharge, over-discharge, expose to heat, or use with unsupported devices.