INR21700-50E — 21700 lithium-ion cell

About the Samsung SDI INR21700-50E 21700 Li-ion Cell 4,900 mAh 9.8 A

The INR21700-50E is the energy cell in Samsung's 21700 range: 4,900 mAh minimum standard capacity with 9.8 A continuous discharge and 69.5 g per cell. It is the reference cell for packs that are sized by runtime rather than by peak current, and it remains the right answer for platforms already validated around it.

Why pack builders specify it

• 4,900 mAh minimum standard capacity, 4,753 mAh minimum at 1 C discharge
• 69.5 g makes it the lightest 5 Ah-class 21700 here, about 1.5 g under the 50GB
• Initial AC impedance at or below 13.5 mΩ for predictable parallel current sharing
• Long validation history across power banks, portable stations and e-bike packs

Typical applications

• Portable power stations – High watt-hours per cell keeps cell count and BMS channels down
• Long-range e-bike packs – 10S to 14S builds where average current stays well under 9.8 A per cell
• Power banks and mobile storage – Capacity-first designs with modest discharge rates
• Solar lighting and backup power – Overnight runtime per cell is the sizing constraint

Where it fits

Stay with the 50E for validated designs, weight-sensitive builds and capacity-first packs. For a new mobility or robotics project started from scratch, evaluate the 50GB first — same capacity and current, stronger venting and can. Neither handles sustained loads above 9.8 A.

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

Specification basis: Official Samsung SDI spec V1.0.