- Stock: In Stock
- Model: INR21700-50S
Original Samsung INR21700-50S 5000mAh 35A High-Drain Rechargeable Li-ion Battery
The Samsung INR21700-50S is a 21700 Li-ion cell with 5000 mAh nominal capacity and 25A continuous discharge, or up to 35A maximum continuous with 80°C temperature cutoff. It is intended for high-drain applications including e-bikes, e-scooters, power tools, flashlights, EV modules, and custom spot-welded battery packs.
- Battery type / size: Li-ion 21700 (rechargeable)
- Nominal capacity: 5000 mAh (minimum 4900 mAh)
- Nominal voltage: 3.6V–3.7V (full charge 4.2V)
- Discharge rating: 25A continuous; 35A max continuous with 80°C temperature cutoff
- Terminal type: Flat top
- Applications: High-power electric bikes/scooters, power tools, high-drain flashlights, EV modules, and custom DIY spot-welded battery packs
Detailed description
The Samsung INR21700-50S is a high-drain 21700 lithium-ion cell manufactured by Samsung SDI. It provides 5000 mAh nominal capacity and a 35A discharge rating when thermal management is applied. The cell is intended to maintain voltage under heavy load and is suitable for multi-series and multi-parallel configurations such as 10S, 13S, and 16S using spot-welded nickel strips.
It can sustain a constant 25A draw without thermal throttling and up to 35A with appropriate cooling. It is intended for configurations that require high current delivery and cycle stability.
Technical specifications
- Brand / model: Samsung SDI / INR21700-50S
- Chemistry: Li-ion (NMC)
- Form factor: 21700
- Nominal capacity: 5000 mAh
- Minimum capacity: 4900 mAh
- Nominal voltage: 3.60V
- End-of-charge voltage: 4.20V ± 0.05V
- Discharge cut-off voltage: 2.50V
- Max continuous discharge current: 25A without temperature cut-off; 35A with 80°C temperature cut-off
- Standard charge current: 2.5A (0.5C)
- Fast charge current: 6.0A
- Internal resistance (AC 1 kHz): ≤ 12 mΩ
- Dimensions: Diameter 21.25 mm; height 70.70 mm
- Weight: Approx. 72.0 g
- Terminal construction: Flat top
Safety and usage notice
- Li-ion cells are unprotected industrial batteries.
- Must be used with a suitable BMS (Battery Management System) capable of managing high continuous current.
- Do not short-circuit, overcharge above 4.2V, or over-discharge below 2.5V.
- Keep away from heat sources and direct sunlight; monitor cell temperature during high-current operations.
