INR21700-6500D 6500mAh 3.5V Li-ion Battery – Specification Overview & Key Benefits
The Great Power INR21700-6500D is a 6500mAh 21700 battery cell designed for high-drain applications requiring long cycle life. Before we dive into the details, let’s address the real challenges you face when sourcing lithium-ion cells.
If you source for power tools, e-bikes, energy storage systems, or industrial devices, you know the challenge: finding a high capacity lithium ion battery that balances stable discharge under load and long cycle life – all while staying within safe thermal limits. Many cells claim high capacity but sag under 10A+ discharge, or degrade quickly after 300 cycles. Others require overly conservative charging currents that slow down production or end-user charging experience.
We hear this from wholesalers and project buyers every day. That is why we are introducing the Great Power INR21700-6500D – a 21700 cylindrical cell built for real-world demanding applications. As a trusted 21700 battery supplier at www.becellbattery.com, we are committed to delivering reliable power solutions for your projects.
What Makes the INR21700-6500D 21700 Battery Different?
This is not just another 6500mAh cell. It is engineered with a balanced chemistry that delivers:
- Rated capacity: 6500mAh – making it a true high capacity 21700 cell
- Nominal voltage: 3.5V – a practical midpoint that works well with most BMS designs
- Low internal resistance: ≤25mΩ (ACIR, 1kHz, PTC-free) – meaning less heat, more usable energyThis is not just another 6500mAh cell. It is engineered with a balanced chemistry that delivers:
The PTC-free design with CID protection gives you overcharge and overpressure safety without adding unnecessary resistance. That translates to better efficiency and cooler operation at high currents.
INR21700-6500D Battery Performance: High Discharge & Long Cycle Life
We focus on three real-world metrics:
1. High-rate discharge capability
At 3125mA, you retain ≥95% of rated capacity. At 6250mA, still ≥93%. Even at 12.5A maximum continuous discharge, the cell holds voltage well – making it an ideal high discharge 21700 battery for power-hungry devices.
2. Reliable cycle life
Tested under 3A charge / 7.5A discharge (recommended conditions), the cell retains ≥80% of its initial capacity after 500 cycles at 25±2°C. For most industrial applications, that means years of service before replacement.
3. Temperature versatility
- Charge from 0°C to 65°C (with current derating below 15°C)
- Discharge from -20°C to 65°C
- At -10°C discharge (7.5A), you still get ≥5043mAh – about 78% of room-temperature capacity. This ensures your products work in cold warehouses or outdoor winter conditions.
INR21700-6500D Key Specifications – The Numbers You Actually Need
| Parameter | Value |
|---|---|
| Max charge current | 4500mA (CC-CV, 4.2V) |
| Recommended discharge | 7500mA |
| Max discharge | 12500mA |
| Charge cut-off | 125mA |
| Discharge cut-off | 2.5V |
| Weight | ≤74g |
| Dimensions | D≤21.75mm, H≤71.0mm |
These are not just lab numbers – they are verified under IEC62133-2, UN38.3, UL1642, and GB31241 standards, ensuring this UN38.3 lithium battery meets global shipping and safety requirements.
Where to Use the INR21700-6500D 21700 Battery?
The INR21700-6500D fits a wide range of commercial and industrial applications:
- Cordless power tools – high drain, fast charging, and durability
- E-bikes and light EVs – 6500mAh gives longer range per pack
- Portable power stations – reliable backup for outdoor or emergency use
- Robotics and AGVs – stable voltage under variable loads
- Medical equipment – safe and consistent energy delivery
- Energy storage systems – rack-mounted or home battery modules
Its 21700 form factor is industry-standard, making it easy to integrate into existing pack designs with minimal retooling.
Storage & Handling – Practical for Bulk Buyers
- Shipping voltage: 3.30~3.50V (within 10 days of factory) – safe for air and sea transport
- Long-term storage: Keep at 30%~50% SOC, room temperature, recharge every 6 months
- Shelf life: One-year warranty from shipment against manufacturing defects
We also provide clear handling guidelines to avoid short circuits, mechanical damage, or improper charging – reducing your after-sales risks. Proper storage and handling of the INR21700-6500D ensure optimal performance and service life.
Why Choose the INR21700-6500D for Your Next Project?
- Proven safety – passed over 10 stringent safety tests The INR21700-6500D offers proven safety with UN38.3 and UL1642 certifications.
- High energy density – 6500mAh in a 74g package
- Consistent quality – manufactured by Great Power, a listed company with ISO and IATF certifications
- Eco-compliant – ROHS2.0, REACH, and EU Battery Directive compliant
We understand that procurement managers need more than just a datasheet – you need confidence in supply chain, quality consistency, and technical support. Our engineering team can assist with pack design, BMS matching, and thermal management advice.
Ready to Evaluate?
We offer sample quantities for testing and full production orders with competitive lead times. Learn more about our company and our commitment to quality. Tell us your target application, expected monthly volume, and any custom tab/welding requirements – we will respond with a tailored quotation within 24 hours.
📧 Email: info@becellbattery.com
📱 WhatsApp/Phone: +86 15360987918
🌐 Website: www.becellbattery.com
Or reply to this post – we will reach out directly.
Reach out now for datasheets, sample pricing, or bulk order inquiries. We look forward to powering your next project.
Great Power INR21700-6500D – Built for performance, trusted for safety, priced for scale.