INR21700-40T — 21700 lithium-ion cell
Samsung SDI INR21700-40T: 4,000 mAh standard capacity, 3.6 V nominal, 35 A continuous discharge rising to 45 A with an 80 °C temperature cut-off, 70.0 g max, initial AC impedance at or below 12 mΩ, 6 A rated charge in about 70 minutes.
Specification
INR21700-40T parameters
| Parameter | Value |
|---|---|
| Brand | Samsung SDI |
| Model | INR21700-40T |
| Form factor | 21700 |
| Chemistry | NMC |
| Nominal voltage | 3.6 V |
| Typical capacity | 4,000 mAh |
| Discharge current | 35 A |
About the Samsung SDI INR21700-40T 21700 Li-ion Cell 4,000 mAh 35 A
The INR21700-40T is the sustained-current option in Samsung's 21700 line. It trades 1,000 mAh against the 50S for 35 A continuous discharge and an initial AC impedance at or below 12 mΩ, which keeps voltage sag predictable when the load is heavy and continuous. Rated 6 A charge brings a pack back in roughly 70 minutes.
Why pack builders specify it
- 35 A continuous discharge, the highest unconditional figure in this group
- Initial AC impedance at or below 12 mΩ keeps terminal voltage up under sustained load
- 6 A rated charge fills a cell in about 70 minutes versus 180 minutes on the 2 A standard rate
- Long production history means holder, busbar and BMS options are mature and well documented
Typical applications
- FPV racing and freestyle drones – Sustained high current with flat voltage under full throttle; 4,000 mAh keeps all-up weight sane
- Cordless power tools – Drills, saws and grinders that pull hard in repeated bursts
- E-scooters and e-skateboards – 35 A continuous suits compact packs with few parallel cells
- High-output lighting – Searchlights and work lights that run at the top of their output range
Where it fits
Use the 40T where the load is genuinely continuous and high — FPV, tools, small high-power traction packs. If runtime is the priority and current stays under 15 A, the 53G or 50E stores more energy per cell and per gram of pack mass.
Charging and pack integration
Charge CC-CV to 4.2 V within the current limits listed above and stop discharge at 2.5 V. These are unprotected industrial cells: a BMS or protection circuit is required, interconnects must be resistance or laser welded rather than soldered, and cells of different model, batch or state of charge must not be mixed in one pack. Charging below 0 °C is not permitted unless the pack implements a low-temperature charge strategy.
Certifications and documentation
UN38.3, MSDS, IEC 62133-2, UL 1642, CE, RoHS, REACH, PSE, KC, BIS, CB. UN38.3 test summary, MSDS and the cell specification are available on request.
Packaging
| Quantity per box | 130 pcs |
|---|---|
| Gross weight per box | 10.2 kg |
Specification basis: Official Samsung SDI spec.
Questions about this cell
Compare
Other 21700 cells to quote against
| Model | Brand | Capacity | Discharge | Data sheet |
|---|---|---|---|---|
| INR21700-P42A | Molicel | 4,200 mAh | 45 A | On file |
| INR21700-50GB | Samsung SDI | 4,900 mAh | 9.8 A | Pending |
| INR21700-P45B | Molicel | 4,500 mAh | 45 A | On file |
| INR21700-50E | Samsung SDI | 4,900 mAh | 9.8 A | Pending |
Capacity and discharge figures are the values held for each model; where no manufacturer data sheet is on file the row is marked pending rather than presented as verified.
Applications
Duties this grade of cell is specified for
Related
Where else to look
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