Samsung INR21700-58E 5500mAh 11A Li-ion Battery for E-Bikes, Flashlights & DIY Battery Packs (1-100 PCS)

The Samsung INR21700-58E 5500mAh 11A Continuous Discharge Li-ion Rechargeable Battery represents the cutting edge of energy density in the 21700 form factor. Manufactured by Samsung SDI and supplied by DXF POWER with strict quality grading, this flat-top unprotected cell delivers a massive 5500mAh typical capacity (5330mAh minimum) on a 3.64V nominal platform with a reliable 11A constant continuous discharge rating. Engineered for maximum runtime per charge, long cycle life, and excellent thermal stability, the 58E is the premier high-capacity power cell for electric bicycles (e-bikes), electric scooters, long-range LED torches, robotics, and custom DIY battery packs.

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Key Features

• Genuine Samsung SDI 58E Cell: Authentic Grade-A 21700 cylindrical cell engineered by Samsung SDI for class-leading energy density and endurance
• 11A Constant Continuous Discharge: Delivers true 11A continuous current output for dependable energy delivery in electric mobility and power packs
• 5500mAh Ultra-High Capacity: 5500mAh typical (5330mAh minimum) offers exceptional operating runtime for long-distance transport and lighting
• CC-CV Fast Charging Support: Charges to 4.20V with up to 5,500mA maximum charging constant current
• Standard 21700 Bare Cell Format: Flat-top design (21.78 mm maximum diameter × 71.0 mm maximum height) optimized for spot-welded custom battery 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.: INR21700-58E (58E)
• Cell Type: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Positive Pole: Flat (Flat Top)
• Protection Circuit: None (Unprotected industrial bare cell; requires compatible device-level or pack-level protection)
• Typical Capacity: 5500mAh
• Minimum Capacity: 5330mAh (at 0.2C discharge to 2.5V after standard charge)
• Nominal Voltage: ≤ 3.636V (3.64V)
• Charging Method: CC-CV
• Charging Voltage: 4.20V
• Max. Charging Constant Current: 5,500mA (5.5A)
• Discharge Cut-off Voltage: 2.50V
• Continuous Maximum Discharge Current: 11A
• Storage Temperature: 1 year: -20°C to 23°C; 3 months: -20°C to 45°C; 1 month: -20°C to 60°C
• Maximum Dimensions: Diameter: 21.78 mm (max) × Length: 71.0 mm (max)
• Weight (Max.): 74 g
• Applications: Electric bicycles (e-bikes), electric scooters, high-lumen flashlights, robotics, portable energy storage, and custom DIY battery packs

Package Includes

• Samsung INR21700-58E 5500mAh 11A 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 ultra-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 up to 4.20V.
• Never charge above 4.20V per cell or discharge below 2.50V per cell.
• Never exceed the maximum continuous discharge current of 11A.
• 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; special insulated battery cases are recommended.
• 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 58E cells with authentic 5500mAh capacity and 11A 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 5500mAh capacity, reliable 11A continuous output, and long cycle durability 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.