Samsung SDI INR21700-50E 5000mAh 15A 3.7V High-Drain Li-ion Battery – 1000+ Cycles & 14mΩ Low IR for Flashlights & Power Banks (2-Pack / Flat/Button/Welded/Wired/Protected Options)

Product Description:
The Samsung SDI INR21700-50E is a premium-grade 21700 lithium-ion battery cell engineered for high-capacity energy storage and reliable power delivery. This 2-Pack bundle delivers a massive 5000mAh capacity per cell, a stable 15A continuous discharge current, and an ultra-low internal resistance of just 14~15mΩ, providing exceptional performance for high-drain devices.

Manufactured by Samsung SDI, a global leader in battery technology, this cell offers a 1000+ cycle life with 90% capacity retention, ensuring long-term reliability and value. It features a built-in safety valve with an explosion-proof design, safely venting internal gases to prevent swelling or rupture in extreme conditions.

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

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

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

3. Spot-Welded Tabs (2-Pack): Pre-welded nickel strips for easy connection to your wiring.

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 (5A discharge limit; size: 21.5mm x 75mm).

Key Features:

• 2-Pack of Authentic Samsung SDI INR21700-50E Cells: Premium-grade 21700 Li-ion batteries from a globally trusted brand.

• 5000mAh High Capacity: Provides massive energy for extended runtimes, significantly reducing charging frequency.

• 15A Continuous Discharge Current: Delivers stable 15A output for high-power devices.

• Ultra-Low Internal Resistance (14~15mΩ): Ensures minimal heat generation and maximum energy transfer efficiency.

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

• Built-In Safety Valve: Explosion-proof design safely releases internal gases in extreme conditions.

• Versatile 5 Options: Choose the perfect configuration for your project from Flat Top, Button Top, Welded Tabs, Wired, or Protected versions.

Product Parameters (Based on Spec Sheet & Images):

• Brand: Samsung SDI

• Model: INR21700-50E

• Size: 21700

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

• Nominal Voltage: 3.7V

• Full Charge Voltage: 4.2V

• Continuous Discharge Current: 15A (Standard) / 5A (Protected Version)

• Internal Resistance: 14~15mΩ

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

• Safety: Positive terminal safety valve, 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-Performance LED Flashlights: Powers high-lumen tactical flashlights, headlamps, and searchlights.

• Portable Power Banks: Ideal core cell for building high-capacity mobile power supplies.

• Small Household Appliances: Reliable power for portable fans, radios, and microphones.

• Electronic Measurement Tools: Stable power for digital levels and other precision instruments.

• DIY Electronics & Battery Packs: Perfect for custom power projects requiring reliable 15A output.

Frequently Asked Questions (FAQ):

Q1: What is the discharge current of this battery?
A1: The Samsung 50E is rated for a stable 15A continuous discharge current. Please note that the Protected Board version is limited to 5A to ensure protection circuit safety.

Q2: What is the difference between the 5 variants?
A3: * Flat Top: Standard 70mm height for most devices. * Button Top: 73mm height with a protruding nub for recessed contacts. * 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 against over-charge/discharge.

Q3: How long does this battery last on a full charge?
A4: With a 5000mAh capacity, it provides very long runtimes. The actual duration depends on the power draw of your specific device.

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.