Samsung SDI INR21700-50S 5000mAh 25A 3.7V High-Drain Li-ion Battery – 5C Discharge, 12mΩ Ultra-Low IR for High-Power Tools & Vehicles (2-Pack / Flat/Button/Welded/Wired/Protected Options)

Product Description:
The Samsung SDI INR21700-50S is a premium automotive-grade 21700 lithium-ion battery cell engineered for extreme high-power, high-torque applications. This 2-Pack bundle delivers a massive 5000mAh capacity per cell, an impressive 25A (5C) continuous discharge current, and an ultra-low internal resistance of just ≤12mΩ, providing explosive, sustained power for the most demanding devices.

Manufactured by Samsung SDI, this cell offers exceptional cycle life (≥90% capacity retention after 1000 cycles) and features a built-in safety valve with an automotive-grade explosion-proof design, safely venting internal gases to prevent swelling or rupture.

To suit your specific project needs, we offer 5 customized options:

1. Flat Top (2-Pack): Standard 21mm x 70mm flat terminal (≤11mΩ IR).

2. Button Top (2-Pack): 21mm x 73mm with a protruding nub for recessed contacts (≤14mΩ IR).

3. Spot-Welded Tabs (2-Pack): Pre-welded nickel strips for easy connection (≤11mΩ IR).

4. Wired (Red/Black) (2-Pack): Pre-soldered positive and negative wires for plug-and-play convenience.

5. Built-in Protection Board (2-Pack): Includes over-charge, over-discharge, and over-current protection (Discharge limit: 5A; Size: 21.5mm x 75mm).

Key Features:

• 2-Pack of Authentic Samsung SDI INR21700-50S 50S Cells: Premium automotive-grade 21700 Li-ion batteries.

• 5000mAh High Capacity: Provides massive energy for extended runtimes.

• 25A (5C) High Continuous Discharge: Delivers explosive 25A power output for high-torque power tools and electric vehicles.

• Ultra-Low Internal Resistance (≤12mΩ): Ensures minimal heat generation and maximum power transfer efficiency.

• 1000+ Cycle Life (≥90% Retention): Offers excellent long-term value and durability.

• Built-In Safety Valve: Automotive-grade explosion-proof design safely releases internal gases.

• Automotive Grade Quality: Manufactured to Samsung's rigorous automotive standards for reliability and safety.

• Versatile 5 Options: Choose from Flat Top, Button Top, Welded Tabs, Wired, or Protected versions.

Product Parameters (Based on Spec Sheet & Images):

• Brand: Samsung SDI

• Model: INR21700-50S

• Size: 21700

• Capacity: 5000mAh (Typical) / 4900mAh (Minimum)

• Nominal Voltage: 3.7V

• Full Charge Voltage: 4.2V

• Continuous Discharge Current: 25A (5C) / 5A (Protected Version)

• Internal Resistance: ≤12mΩ (Flat/Welded) / ≤14mΩ (Button)

• Cycle Life: ≥ 1000 cycles (≥90% retention after 1000 cycles)

• Safety: Positive terminal safety valve, automotive-grade explosion-proof design

• Dimensions (Based on Variant):

  • Flat Top / Welded / Wired: 21mm (Dia) x 70mm (H)

  • Button Top: 21mm (Dia) x 73mm (H)

  • Protected Board: 21.5mm (Dia) x 75mm (H)

• Pack Quantity: 2-Pack (Selectable)

Applications:

• High-Torque Cordless Power Tools: Drives heavy-duty drills, impact drivers, and saws demanding 25A burst power.

• Electric Scooters & Light Vehicles: Reliable power core for electric scooters, e-bikes, and golf carts.

• High-Performance RC Hobbies & Drones: Sustained high-current power for high-torque RC cars and heavy-lift drones.

• High-Capacity Portable Power Stations: Ideal core cell for building high-power portable energy storage systems.

• Automotive & Industrial Equipment: Automotive-grade reliability for demanding industrial machinery and tools.

Frequently Asked Questions (FAQ):

Q1: What is the discharge current of this 50S battery?
A1: The Samsung 50S is rated for an impressive 25A (5C) continuous discharge current. This is significantly higher than standard cells, making it the perfect choice for high-torque power tools and electric vehicles.

Q2: What is the advantage of the ultra-low ≤12mΩ internal resistance?
A2: A ≤12mΩ internal resistance means this battery generates much less heat and loses very little energy during 25A high-current discharge. More power reaches your device, and the battery runs cooler, extending its lifespan.

Q3: What is the difference between the 5 variants?
A4: * Flat Top: Standard 70mm height, ≤11mΩ IR. * Button Top: 73mm height with protruding nub for recessed contacts, ≤14mΩ IR. * Welded Tabs: Pre-welded nickel strips for easy connection. * Wired: Pre-soldered red/black wires for plug-and-play. * Protected: Includes a protection board (5A, 75mm height) for enhanced safety.

Q4: What kind of charger should I use for this battery?
A5: You must use a charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. A smart charger with over-charge protection is highly recommended.