Description

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.

Specifications

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

Features

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

COMPATIBILITY

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