21700A Lithium-Ion Rechargeable Battery – 4.2V 5000mAh High Capacity (Made in Japan)

21700A Lithium Ion Rechargeable Battery – Best 5000mAh High Capacity Battery in Bangladesh

If you are tired of batteries that claim high capacity but die in minutes, the 21700A Lithium Ion Rechargeable Battery is the solution you need. This is a genuine 5000mAh cell that provides a stable 4.2V output at full charge. Unlike generic batteries found in local markets, this unit is Made in Japan, ensuring it meets strict quality standards for safety and longevity. It is the perfect choice for high-drain devices that require a steady flow of power over long periods.

In Bangladesh, where load shedding is a common issue, having a reliable power source for your emergency lights or DIY power banks is essential. Whether you are a student working on a robotics project at BUET or a commuter using a high-powered flashlight during late-night travels in Dhaka, this 21700 cell offers the runtime you can count on. It handles the humid weather of Bangladesh quite well, maintaining its performance without overheating under normal use.

Key Features of 21700A Lithium Ion Battery

• High 5000mAh Capacity: Offers significantly more runtime than standard 18650 cells.
• Made in Japan: Built with superior chemical stability for thousands of charge cycles.
• Stable Voltage Output: Operates at 3.7V nominal and reaches 4.2V when fully charged.
• Low Self-Discharge: Holds its charge for months when not in use, perfect for emergency kits.
• Multi-Purpose Use: Ideal for LED flashlights, electric screwdrivers, and custom battery packs.

Reliable Performance for Every Project

The 21700A battery is designed for those who demand consistency. Most cheap batteries sold in local stores drop voltage quickly under load, but this Japanese cell maintains a flat discharge curve. This means your devices will stay at full brightness or full speed for much longer. For those building solar-powered systems for rural areas in Bangladesh, these batteries provide a compact yet powerful storage solution that lasts for years rather than months.

Design and Build Quality

The physical construction of this battery is robust. It features a standard 21700 form factor (21mm diameter and 70mm length). The outer casing is durable, protecting the internal chemistry from minor impacts. The positive and negative terminals are designed for easy soldering or placement in high-quality battery holders. Since it is a Japanese-made cell, the internal resistance is kept very low, which prevents the battery from getting excessively hot during fast charging or high-drain usage.

Versatile Charging and Safety

Safety is a major concern when dealing with lithium batteries. This 21700A cell is engineered to handle heat better than budget alternatives. It can be charged using standard Li-ion chargers that support the 21700 size. We recommend using a quality charger to ensure the longevity of the 5000mAh capacity. For those living in areas with frequent power fluctuations, this battery provides a stable energy reservoir for your electronic gadgets.

Who Should Buy the 21700A Battery?

• Flashlight Enthusiasts: People who need high lumens and long runtimes for night camping or security work.
• DIY Hobbyists: Anyone building their own power banks, Bluetooth speakers, or portable fans.
• Electric Vehicle Owners: Perfect for those looking to replace or upgrade cells in e-bikes or electric scooters.
• Solar Energy Users: Residents in off-grid areas needing reliable storage for small solar setups.

Why Buy from Gadgeterians?

• 100% genuine product with quality check before shipping
• Cash on Delivery available across all 64 districts of Bangladesh
• Fast delivery – ৳60 inside Dhaka, ৳120 outside Dhaka
• 7-Day Replacement Guarantee for manufacturing defects
• Trusted gadget store focused on reliable service

What’s in the Box?

• 1 x 21700A Lithium Ion Rechargeable Battery (5000mAh)

Frequently Asked Questions

Q: Is this battery original or a copy?

It is a 100% original high-capacity cell made in Japan, ensuring the 5000mAh rating is accurate.

Q: Can I use this in my normal 18650 flashlight?

No, 21700 batteries are larger than 18650s. Please check if your device specifically supports the 21700 size before buying.

Q: How long does it take to charge?

Depending on your charger’s speed, it usually takes 3 to 5 hours for a full charge from empty.

Q: Does it come with a protection circuit?

This is a flat-top industrial cell. It is recommended for use in devices that have built-in protection or within custom packs with a BMS.

Q: Can I use this for my e-bike battery pack?

Yes, these are excellent for building high-capacity e-bike packs due to their high energy density.

Q: Is it safe for the Bangladesh summer heat?

Yes, Japanese cells are tested for higher thermal stability, but always store batteries in a cool, dry place away from direct sunlight.

Q: What is the lifespan of this battery?

Typically, it can handle 500 to 1000 charge-discharge cycles before the capacity starts to noticeably drop.

What is the price of 21700A Lithium Ion Rechargeable Battery in Gadgeterians?

The current price of the 21700A 5000mAh battery is only ৳500.00 at Gadgeterians. Considering the genuine Japanese build and real 5000mAh capacity, this is the best value-for-money battery currently available in the Bangladesh market. Order now with Cash on Delivery for quick shipping to your doorstep.