21700 4000mAh 40A High Rate Rechargeable Battery with 300 Cycles

INR21700N40A40 3.7V 4000mAh 40A 300 Cycles 21700 Battery

Product Name

INR21700-4000-3.7 21700 Battery

Advantages

• High energy density and long cycle life
• Superior high-rate discharge capability for demanding applications
• Enhanced safety and thermal stability
• Certified for compliance with international standards

Specifications

Cycle Life

Discharge Curve

Operating Temperature Range

Certifications

• BIS, KC, BSMI, CB, UL, CCC

Key Features

• High discharge rate up to 40A
• Excellent thermal stability and safety
• Long cycle life with minimal capacity degradation
• Environmentally friendly and RoHS compliant

Applications

• Electric tools (e.g., drills, saws)
• Floor cleaning machines (e.g., scrubbers, sweepers)
• Vacuum cleaners
• High-power portable devices

Usage Warnings & Precautions

• Use only with compatible chargers and devices.
• Avoid short-circuiting, overcharging, or over-discharging.
• Do not expose to high temperatures, fire, or water.
• Keep away from children and pets.

Storage Guidelines

• Store at 20±5°C with 50% SOC for optimal performance.
• Avoid storing in high humidity or extreme temperatures.
• Recharge every 6 months if stored for extended periods.

Warranty & Disclaimer

• 12-month limited warranty from the date of purchase.
• Warranty does not cover damage due to misuse, improper charging, or unauthorized modifications.
• Manufacturer is not liable for accidents caused by improper use.

Our Mission:  Original Innovation, Power the Future!

As a high-tech enterprise specializing in the R&D and manufacturing of lithium-ion batteries, sodium-ion batteries, and solid-state batteries. Founded in 2020 in Shenzhen, China’s innovation hub, we are driven by our core philosophy of "Original Innovation & Development" , delivering sustainable, high-performance energy solutions for global applications, including consumer electronics, smart devices, electric vehicles, and energy storage systems.

With dozens of proprietary patents, the accreditation of Guangdong Provincial Eco-Friendly Lithium Battery Engineering Research Center, and strategic collaborations with leading institutions like National University of Singapore, Wuhan University, and Shenzhen University, OiD continuously pushes the boundaries of battery technology. Our products power critical infrastructure, including high-speed rail energy storage, residential solar systems, and defense projects, accelerating the global transition to clean energy.

Key Strengths

1.  Original Innovation
   • Core technologies in Li/Na-ion and solid-state batteries, backed by inventions, utility models, and design patents.
   • Joint R&D centers with top universities (e.g., Wuhan University), enabling rapid commercialization of cutting-edge research.
2.  End-to-End Energy Solutions
   • 500+ customizable battery models for consumer electronics, EVs, and grid-scale storage.
   • Superior performance: high energy density, fast charging, extended cycle life, and extreme-temperature resilience
3. Sustainability Commitment
   • Eco-conscious materials (e.g., cobalt-free cathodes, solid electrolytes) and processes to minimize environmental impact.
4. Global Reach
   • R&D Hubs: Shenzhen, Wuhan (university partnerships)
   • Manufacturing: Automated production lines in Shenzhen
   • Markets: Asia, Europe, North America