The Samsung INR21700-40T 3.6V 4000mAh Li-ion Battery (Button Top) is a premium high-drain rechargeable lithium-ion battery engineered for applications requiring exceptional power output and long runtime. With its 4000mAh capacity and high continuous discharge capability, it is ideal for power tools, high-performance flashlights, battery packs, portable power stations, electric mobility devices, and other demanding electronic equipment.
Manufactured by Samsung SDI, the INR21700-40T combines high energy density with outstanding cycle life and excellent thermal stability. The button top terminal allows compatibility with devices designed for protected or button-top 21700 cells, making it a dependable choice for both professional and enthusiast applications.
| Brand: | Samsung SDI |
| Model: | INR21700-40T (Button Top) |
| Chemistry: | Lithium-ion (INR) |
| Nominal Capacity: | 4000 mAh |
| Open Circuit Voltage: | 4.20 Volt (Fully Charged) |
| Nominal Voltage: | 3.6 Volt |
| Nominal Energy: | 14.4 Wh |
| Max. Continuous Discharge Current: | 35A |
| Standard Charge Current: | 2A |
| Fast Charge Current: | 6A |
| Charge Cut-off Voltage: | 4.20 Volt |
| Discharge Cut-off Voltage: | 2.5 Volt |
| Storage: | Store in a cool, dry place |
| Operating Temperature: | Charge: 0°C to +45°C / Discharge: -20°C to +75°C |
| Battery Size: | 21700 |
| Dimensions: | 21.0mm Diameter × 70.0mm Height |
| Terminal: | Button Top |
Key Features:
- Premium Samsung SDI high-drain rechargeable lithium-ion cell
- 4000mAh capacity for extended runtime
- High 35A continuous discharge capability
- Stable 3.6V nominal output
- Button top terminal for wider device compatibility
- Excellent cycle life and high energy density
- Low internal resistance for demanding applications
- Ideal for power tools, flashlights, battery packs, and portable power systems
- Rechargeable hundreds of times with proper charging equipment
- Manufactured to Samsung SDI quality standards
Also Known As:
- INR21700-40T
- Samsung 40T
- 21700 Button Top Battery
- 4000mAh 21700 Battery
- 3.6V Li-ion Battery
- Rechargeable 21700 Cell
- Samsung SDI 40T
Common Applications:
- High-Power Flashlights
- Power Tools
- Portable Power Stations
- Battery Packs
- Electric Bicycles
- Electric Scooters
- Medical Equipment
- Industrial Electronics
