Samsung INR21700-50GB 5000mAh 15A Li-ion Battery for E-Bikes, Flashlights & DIY Battery Packs (1-100 PCS)

The Samsung INR21700-50GB 5000mAh 15A Li-ion Rechargeable Battery is an ultra-high energy density 21700 cylindrical power cell manufactured by Samsung SDI (Korea) and supplied by DXF POWER with strict quality grading. Featuring an impressive 5000mAh typical capacity (4900mAh minimum) on a 3.66V nominal platform, this unprotected flat-top cell provides up to 15A continuous discharge, outstanding cycle stability (maintaining ≥80% capacity after 1,000 cycles), and broad operating temperatures (-30°C to 60°C discharge). It is the ideal high-capacity power solution for electric bicycles (e-bikes), electric scooters, long-runtime LED torches, robotics, solar energy storage, and custom DIY battery packs.

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Key Features

• Genuine Samsung SDI 50GB Cell: Premium Grade-A 21700 cell engineered in Korea for maximum energy density and exceptional cycle life
• 5000mAh Ultra-High Capacity: 5000mAh typical (4900mAh minimum) ensures extended runtime in portable electric vehicles and high-drain electronics
• 15A Continuous Discharge: Reliable current delivery capable of supporting continuous draw up to 15A without compromising cell longevity
• Exceptional 1,000+ Cycle Life: Retains ≥80% of initial capacity even after 1,000 charge/discharge cycles under recommended cycling conditions
• Wide Temperature Operating Range: Discharges reliably from -30°C to 60°C and charges from 0°C to 50°C
• Standard 21700 Form Factor: Max dimensions (D) 21.3 × (L) 70.65 mm (±0.15 mm), flat top bare cell design ideal for spot welding and pack fabrication
• Multiple Pack Bundles: Available in 1, 10, 20, 50, and 100 piece packages to suit single replacements or volume pack assembly
• 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)
• Part No. / Model: Samsung INR21700-50GB (50GB Bare Cell)
• Cell Origin: Made in Korea
• Cell Type: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Positive Pole: Flat (Flat Top)
• Protection Circuit: No (Unprotected industrial bare cell)
• Typical Capacity: 5000mAh
• Minimum Capacity: 4900mAh (1C = 4900mA)
• Nominal Voltage: 3.66V
• Charging Voltage: 4.20 ± 0.03V (4.125V for cycle life)
• Charging Method: CC-CV
• Charging Current Rate: 0.33C (1617mA)
• Standard Charge Time: 240 minutes
• Cut-off Voltage: 4.2V (4.125V for cycle life) max charge voltage; 2.5V (3.0V for cycle life) discharge cut-off voltage
• Max. Continuous Discharge Current: 15A
• Cycle Life: Capacity ≥ 80% after 1,000 cycles (80% of initial capacity @ RT)
• Operating Temperature: Charge: 0°C to 50°C; Discharge: -30°C to 60°C
• Maximum Dimensions: Diameter: 21.3 mm × Length: 70.65 mm (±0.15 mm)
• Weight (Max.): 72.0 g
• Applications: Electric bicycles (e-bikes), e-scooters, electric mobility, high-output flashlights, power tools, robotics, and custom DIY battery packs

Package Includes

• Samsung INR21700-50GB 5000mAh 15A 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.
• Standard charging voltage is 4.20V ± 0.03V (charge to 4.125V to maximize cycle life).
• Discharge cut-off voltage is 2.5V (3.0V recommended for prolonged cycle life).
• Charge within 0°C to 50°C; discharge within -30°C to 60°C.
• 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 50GB cells with true 5000mAh high capacity and 15A continuous output
• Tested continuous discharge performance and outstanding 1,000+ cycle life
• 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 high 5000mAh capacity, reliable 15A continuous output, and long 1,000-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.