Samsung INR21700-50S 5000mAh 25A Li-ion Battery for Power Tools, E-Bikes & DIY Battery Packs (1-100 PCS)

The Samsung INR21700-50S 5000mAh 25A Continuous Discharge Li-ion Rechargeable Battery is an industry-leading high-capacity, high-drain 21700 cylindrical power cell. Manufactured by Samsung SDI and supplied by DXF POWER with strict quality grading, this flat-top unprotected cell delivers a massive 5000mAh typical capacity (4800mAh minimum) on a 3.6V–3.7V nominal platform with a proven 25A constant continuous discharge rating (up to 45A continuous when monitored with an 80°C thermal cut-off). Combining extraordinary runtime with serious high-current discharge capability, it is the premier choice for high-power cordless tools, electric bicycles, e-scooters, high-lumen flashlights, robotics, and custom DIY battery packs.

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Key Features

• Genuine Samsung SDI 50S Cell: Authentic Grade-A 21700 cylindrical cell widely recognized for delivering an unmatched combination of 5000mAh capacity and high-drain power
• 25A Constant Discharge Rating: Delivers true 25A constant continuous current without temperature monitoring (and up to 45A continuous with 80°C thermal monitoring)
• 5000mAh Ultra-High Capacity: 5000mAh typical (4800mAh minimum) for maximum runtime and energy density in high-performance portable applications
• Fast CC-CV Charging: Supports up to 2.5A standard charging and up to 6A (6000mA) maximum fast charging current
• Standard 21700 Flat-Top Design: Standard dimensions (21.15 ± 0.1mm diameter × 70.52 ± 0.15mm height) with flat top terminal, ideal for spot-welded packs and modular battery sleds
• Multiple Pack Bundles: Available in 1, 10, 20, 50, and 100 piece packages to suit single replacements or bulk pack fabrication
• Strict Factory Quality Testing: Cells are inspected for voltage balance, low internal resistance, and capacity consistency across every batch

Specifications, Per Battery

• Brand / Manufacturer: Samsung SDI (Supplied by DXF POWER)
• Model: INR21700-50S (50S)
• Cell Type: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Positive Pole: Flat (Flat Top)
• Type Capacity: 5000mAh
• Minimum Capacity: 4800mAh
• Nominal Voltage: 3.6V – 3.7V
• Final Charging Voltage: 4.2V
• Final Discharge Voltage: 2.5V
• Max. Current Output Constant (Continuous): 25A (up to 45A temperature-monitored up to 80°C)
• Charging Current: 0.xx – 2.5A (2500mA)
• Max. Charging Current: 6A (6000mA)
• Charging Method: CC-CV
• Protection Circuit: No (Unprotected industrial cell)
• Diameter: 21.15 mm ± 0.1 mm
• Height: 70.52 mm ± 0.15 mm
• Weight: 72 g ± 1 g
• Applications: Cordless power tools, electric bicycles, e-scooters, electric skateboards, high-output flashlights, robotics, and custom DIY battery packs

Package Includes

• Samsung INR21700-50S 5000mAh 25A battery cells, quantity chosen from 1, 10, 20, 50, or 100 PCS
• Protective packaging / cell box
• User manual and battery safety guide

Choose Your Ideal Power Bundle

• 1 PCS – Quick Replacement & Testing: Single cell for flashlight upgrade, tool testing, or individual cell repair
• 10 PCS – Tool Pack Rebuilds: Perfect for rebuilding heavy-duty cordless power tool battery packs
• 20 PCS – High-Output Modules: Ideal for 36V or 48V auxiliary modules, robotics, and DIY power packs
• 50 PCS – Mobility & Energy Modules: Tailored for high-performance electric bike packs, e-scooters, and portable power stations
• 100 PCS – Master Builder Bulk Set: Best value for workshops, custom pack assemblers, and volume battery builders

Purchasing in bundles ensures matched cell batches for balanced series and parallel assembly.

180-Day Warranty & Customer Support

Every cell batch supplied by DXF POWER is covered by a 180-day manufacturer warranty against defects in materials and craftsmanship. Our technical support team is always available to assist with charging parameters, pack layout recommendations, and safety practices.

Usage & Safety Guidelines

• Use a dedicated lithium-ion smart charger supporting CC/CV charging mode.
• Never charge above 4.2V per cell or discharge below 2.5V per cell.
• Do not exceed cell surface temperature of 80°C during heavy continuous discharge.
• Always inspect cell outer shrink wrap, insulator ring, and terminals for damage before use; rewrap immediately if damaged.
• Never carry loose 21700 batteries in pockets, bags, or purses with metal objects like keys or coins; always store in an insulated battery case.
• Do not short-circuit, crush, incinerate, puncture, or submerge cells in water.
• Store batteries at 3.60V–3.85V per cell in a cool, dry, well-ventilated location away from direct sunlight.
• When building multi-cell packs, always integrate a quality Battery Management System (BMS) with over-current, over-charge, over-discharge, and thermal balance protection.

Why Choose DXF?

• Genuine Grade-A Samsung SDI 50S cells with true 5000mAh capacity and 25A high-drain output
• Tested continuous discharge performance under demanding operational loads
• Carefully matched batches for balanced series and parallel pack assembly
• Strict factory pre-shipment quality checks and secure protective packaging
• Global warehouse logistics network and professional technical customer support

Perfect For

Engineered for contractors, e-mobility builders, DIY pack fabricators, and torch enthusiasts demanding industry-leading 5000mAh capacity and 25A continuous output for high-drain cordless tools, electric transport, robotics, and custom energy modules.

Power your projects with trusted Samsung 21700 performance. Learn more about setups and battery care on the DXF YouTube channel.