Samsung INR21700-40T 21700 flat-top Li-Ion accu 3,6V 4000mAh (INR2170040T)

For high-drain devices that demand reliable power, the Samsung INR21700-40T 21700 battery delivers 4000mAh capacity and 30A continuous discharge. It is a flat-top, unprotected Li-ion cell suited for battery packs, power tools, e-bikes, and high-performance flashlights.

Key specifications

• Battery technology: Lithium-ion (NCA)
• Nominal voltage: 3.6 V
• Nominal capacity: 4000 mAh
• Max continuous discharge: 30 A
• Terminal type: Flat top
• Protection circuit: Unprotected
• Form factor: 21700

Why choose it

This cell offers high energy density and stable voltage under load, making it a solid choice for custom battery builds and replacements.

Ideal use cases

• High-drain portable electronics
• Battery pack assembly
• Electric bicycles and scooters
• High-performance flashlights

Good to know

Unprotected cells require careful handling and should only be used with a proper battery management system or protected device.