The Challenge: Finding a Truly Dependable High-Capacity Cell
As a procurement professional, you know the frustration. Many 4000mAh 18650 battery cell options promise high capacity. But they fail under real loads. Some overstate their ratings. Others degrade after a few dozen cycles. Many struggle in the cold or during high-current pulses.
Your project needs stable power. Whether for power tools, e-bikes, or backup systems. You need a cell that meets its spec sheet. And you need one that exceeds your reliability expectations.
Meet the INR18650-4000D-3C – Built for Performance
Great Power designed this 4000mAh 18650 battery cell to solve these problems. The INR18650-4000D-3C is a cylindrical lithium-ion cell. It offers a typical capacity of 4000mAh (3850mAh minimum). Its nominal voltage is 3.6V.
This cell delivers real energy density. No gimmicks. But capacity is only part of the story. The real value comes from its high discharge rate, wide temperature range, and strong safety features.
Key Performance Highlights for Buyers
Here are the key performance highlights for this 4000mAh 18650 battery cell.
True 3C Continuous Discharge
Many “high-capacity” cells sag under load. This one does not. It supports a maximum continuous discharge of 12000mA (3C). That makes it ideal for high-drain devices. Think power tools, drones, and portable equipment.
Long Cycle Life – Lower Cost Over Time
We tested this cell under standard conditions. 0.5C charge. 1C discharge. After 500 cycles, it keeps ≥80% of its original capacity. That means fewer replacements. Fewer warranty claims. Better customer satisfaction.
Excellent Performance in Cold Weather
Cold temperatures kill standard cells. Not this one. It delivers ≥85% of rated capacity at 0°C. Even at -20°C, you get over 60%. This is a big advantage for outdoor gear, winter sports, and cold-chain logistics.
Low Internal Resistance
The ACIR is ≤25mΩ (PTC-free, at 1kHz, 30% SOC). This reduces heat and voltage drop. You get better energy efficiency and system performance.
How Does the INR18650-4000D-3C Compare to Other 4000mAh Cells?
We benchmarked our cell against two well-known alternatives – the Far East Battery 18650-4000mAh and the Amprius SA110 (SiCore™). All three offer 4000mAh capacity, but key differences set them apart.
Side-by-Side Comparison
| Parameter | Great Power INR18650-4000D-3C | Far East 18650-4000mAh | Amprius SA110 |
|---|---|---|---|
| Brand | Great Power | Far East Battery | Amprius (US) |
| Nominal voltage | 3.6V | 3.60V | 3.52V – 3.6V (spec varies) |
| Max. continuous discharge | 3C (12A) | 2C (8A) | 3C (12A) |
| Pulse discharge (≤30s) | Not specified | Not specified | 5C (20A) |
| Cycle life (to 80% SOH) | 500 cycles (to 2.50V) | 600 cycles (to 70% SOH) | 500+ cycles (to 2.75V) |
| Energy density | 300Wh/kg | Not specified | 282 – 300Wh/kg |
| Cell protection | CID (PTC-free) | Not specified | Not specified |
| Safety certifications | Active – IEC, UL, UN38.3, GB | Not listed | UN38.3 (CCC logo not confirmed) |
What Sets the Great Power Cell Apart
- Higher nominal voltage (3.6V) – more power per cell than Amprius (3.52V in many specs)
- Full cycle test range (to 2.50V) – competitors test to 2.75V, leaving usable capacity untested
- Highest energy density (300Wh/kg) – lighter packs, longer runtime
- Active certifications today – IEC62133-2, UL1642, UN38.3, and GB31241 – ready for global shipping
- CID protection – documented cell-level safety. Not specified in competitor datasheets
Summary
| If your priority is… | Choose… |
|---|---|
| Highest power & active certifications | Great Power |
| Pulse discharge (5C/20A) | Amprius SA110 |
| Cost-sensitive, mid-power applications | Far East |
Our recommendation: For most OEM projects, the Great Power 4000mAh 18650 battery cell offers the best balance of power, energy density, safety, and compliance – all available today with full certifications.
Safety and Reliability – Built-In Protection
Safety comes first. This cell has a CID (Current Interrupt Device) in the cap. It activates under abnormal internal pressure. It disconnects the circuit to stop hazards.
There is no PTC. This allows lower resistance and higher current. The cell still passes all major safety tests. IEC62133-2, UN38.3, UL1642, and GB31241. Tests include short-circuit, overcharge, crush, and thermal exposure. No fire. No explosion. Surface temperature stays below 150°C during short-circuit.
Where Can You Use This Cell?
This is a versatile cell. Use it in:
- Power tools – drills, saws, grinders
- Light electric vehicles – e-bikes, scooters, hoverboards
- Portable energy storage – power banks, solar lanterns, UPS
- Medical and industrial equipment
- Consumer electronics – flashlights, speakers, robotics
For more options, explore our 18650 battery series and compare different capacity and discharge ratings.
Practical Details for Bulk Procurement
- Dimensions: 18.3±0.3mm × 65.2±0.3mm – standard 18650 size. Easy to integrate.
- Weight: 48±2g – light for its energy density.
- Storage: Keep at 30–50% SOC at room temperature. For long storage, recharge every 6 months.
- Warranty: 12 months from shipment. Covers manufacturing defects. Not abuse or misuse.
Why Choose Great Power?
Great Power is an established manufacturer. ISO-compliant production. Strong quality control. This cell meets RoHS2.0, REACH, and EU battery directives. You can use it in products for global markets.
Ready to Secure Reliable Power for Your Project?
Whether you are sourcing a 4000mAh 18650 battery cell for power tools, e-bikes, or portable energy storage, we have the right solution for your project. Every project is different. You may need custom packs. Special testing. Volume pricing. Our engineering team is ready to help.
Contact us today. Request samples. Ask for a datasheet. Or get a quote. We respond within 24 hours.
📧 Email: info@becellbattery.com
🌐 Website: www.becellbattery.com
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