Samsung INR21700-50E 5000mAh 9.8A Li-ion Battery for E-Bikes, Flashlights & DIY Battery Packs (1-100 PCS)

The Samsung INR21700-50E 5000mAh 9.8A Continuous Discharge Li-ion Rechargeable Battery is an industry-benchmark high-capacity 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 (4753mAh minimum) on a 3.6V–3.7V nominal platform with a dependable 9.8A constant continuous discharge rating. As 21700 format batteries rapidly replace older 18650 cells across modern applications, the 50E provides maximum energy density and runtime for electric bicycles, e-scooters, long-range LED torches, robotics, and custom DIY battery packs.

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Key Features

• Genuine Samsung SDI 50E Cell: Authentic Grade-A 21700 cylindrical cell renowned worldwide for outstanding 5000mAh energy density and reliable cycle life
• 9.8A Constant Continuous Discharge: Engineered to sustain a reliable 9.8A continuous current output for energy-focused electronics and multi-cell battery packs
• 5000mAh Ultra-High Capacity: 5000mAh typical (4753mAh minimum) offers exceptional operating runtime per charge
• CC-CV Charging Support: Supports 2.45A standard charging current with up to 4.9A maximum charging current
• Standard 21700 Flat-Top Design: Dimensions of 21.25 ± 0.1 mm diameter × 70.8 ± 0.15 mm height with flat terminals, ideal for spot-welded custom packs
• Multiple Pack Bundles: Available in 1, 10, 20, 50, and 100 piece packages for single cell replacements or large-scale pack fabrication
• Strict Factory Quality Testing: Cells are inspected for voltage balance, internal resistance, and capacity consistency across every batch

Specifications, Per Battery

• Brand / Manufacturer: Samsung SDI (Supplied by DXF POWER)
• Model / Part No.: INR21700-50E (50E)
• Cell Type: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Positive Pole: Flat (Flat Top)
• Protection Circuit: No (Unprotected industrial bare cell)
• Type Capacity: 5000mAh
• Minimum Capacity: 4753mAh
• Nominal Voltage: 3.6V – 3.7V
• Charging End Voltage: 4.2V
• Discharge Cut-off Voltage: 2.5V
• Max. Constant Current Output: 9.8A
• Charging Method: CC-CV
• Charging Current: 2.45A
• Max. Charging Current: 4.9A
• Diameter: 21.25 mm ± 0.1 mm
• Height: 70.8 mm ± 0.15 mm
• Weight: 69 g ± 1 g
• Applications: Electric bicycles (e-bikes), electric scooters, high-lumen flashlights, robotics, portable energy storage, and custom DIY battery packs

Package Includes

• Samsung INR21700-50E 5000mAh 9.8A 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 – Small Pack Rebuilds: Perfect for rebuilding portable power banks and handheld devices
• 20 PCS – Auxiliary & Mobility Modules: Ideal for 24V/36V auxiliary modules, robotics, and compact DIY power packs
• 50 PCS – E-Bike & Scooter Battery Packs: Tailored for high-capacity 36V/48V electric bike packs, e-scooters, and portable energy stations
• 100 PCS – Volume Pack Assembly: 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.
• Never exceed the maximum continuous discharge current of 9.8A.
• 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 50E cells with authentic 5000mAh capacity and 9.8A continuous output
• Tested continuous discharge performance and high energy density
• 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 e-mobility builders, DIY pack fabricators, contractors, and flashlight enthusiasts demanding maximum 5000mAh capacity and reliable 9.8A continuous output for electric bikes, e-scooters, robotics, and custom energy storage modules.

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