The Samsung INR21700-40T is a cylindrical rechargeable lithium-ion cell in 21700 format, suitable for applications requiring high capacity and strong discharge capability.

With 3.6V nominal voltage, 4000mAh typical capacity and 3900mAh listed minimum capacity, this cell is suitable for power systems, battery packs, power tools, technical equipment, compatible flashlights, electric mobility, prototypes and projects requiring a high-performance cell.

The listed maximum discharge current is 35A, with higher values only under controlled conditions with suitable thermal protection. The listed maximum charge current is 6000mA, with 4.2V maximum charge voltage and 2.5V discharge cut-off voltage.

This is an unprotected cell, meaning it does not include integrated protection against overcharge, deep discharge, short circuit or overcurrent. For this reason, it should only be used in equipment or packs with suitable BMS/PCM protection and by technically qualified users.

The flat top format and approximate dimensions of 21.1mm diameter by 70.15mm height make the INR21700-40T suitable for applications that accept 21700 cells without a raised button top. Physical, electrical and safety compatibility must always be checked before use.

Main features

Rechargeable Li-ion battery cell
Brand: Samsung
Reference: INR21700-40T
Supplied EAN: 5609711775136
Format: 21700
Type: cylindrical Li-ion cell
Version: flat top
Integrated protection circuit: no
Nominal voltage: 3.6V
Typical capacity: 4000mAh
Listed minimum capacity: 3900mAh
Maximum charge current: 6000mA
Maximum discharge current: 35A
Maximum charge voltage: 4.2V
Discharge cut-off voltage: 2.5V
Approximate diameter: 21.1mm
Approximate height: 70.15mm
Approximate weight: 70g
Technology: lithium-ion / Li-ion
Main application: cells for compatible high-drain packs and equipment
Requires suitable BMS/PCM protection
Intended for technical/professional use

Recommended applications

21700 battery packs
Compatible power tools
High-drain equipment
Flashlights compatible with flat top 21700 cells
Electronics projects and prototyping
DC power systems
Electric mobility and compatible equipment
Custom batteries with suitable BMS
Replacement of equivalent cells in compatible packs
Applications requiring a 4000mAh 21700 Li-ion cell

Important note

Before purchase and use, always confirm the original cell reference, 21700 format, flat top type, voltage, capacity, discharge current, charge current, dimensions, polarity, holder type, charger used, BMS/PCM and equipment compatibility.

This cell is unprotected and must not be used alone without a suitable protection circuit. Incorrect use may cause overheating, electrolyte leakage, fire or explosion.

Do not charge above 4.2V, do not discharge below 2.5V, do not short-circuit, do not solder directly to the poles, do not puncture, do not open, do not expose to heat and do not mix cells with different brands, capacities, charge states or wear levels.

This item corresponds only to the Samsung INR21700-40T cell. BMS, holder, charger, battery pack, terminals, nickel strip, cables, enclosure and other accessories are not included unless expressly stated otherwise.