Samsung INR18650-25R 2500mAh 20A Li-ion Battery for Power Tools, Flashlights & DIY Battery Packs (1-100 PCS)

The Samsung INR18650-25R 2500mAh 20A Continuous Discharge Li-ion Rechargeable Battery is an industry-benchmark high-drain cylindrical cell trusted worldwide for power-demanding tools and performance electronics. Manufactured by Samsung SDI and supplied by DXF POWER with strict quality grading, this 18650 flat-top cell provides a true 2500mAh nominal capacity at 3.6V (4.20V max charge) with a proven 20A continuous discharge rating. It offers exceptional voltage stability under heavy load, making it the perfect power solution for cordless power tools, high-lumen flashlights, electric scooters, e-bikes, and custom multi-cell DIY battery builds.

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Key Features

• Genuine Samsung SDI 25R Cell: Premium Grade-A cylindrical lithium-ion cell celebrated globally for outstanding reliability, low internal resistance, and long cycle life
• 20A Continuous Discharge: Delivers sustained 20A continuous power output without excessive voltage sag, tailored for heavy load applications
• 2500mAh High Capacity: Optimal balance of high-current discharge and runtime for power tools and portable equipment
• High-Rate Fast Charging: Supports up to 4.0A rapid charging current for minimal downtime between work cycles
• Standard 18650 Flat-Top Design: Standard 18.5 × 65.0mm dimensions with flat top terminal, ideal for spot welding, battery holders, and modular battery sleds
• Multiple Pack Bundles: Available in 1, 10, 20, 50, and 100 piece packages to suit individual 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 / Type: INR18650-25R (25R)
• Chemistry: Lithium-ion (INR / NMC)
• Battery Size / Form Factor: 18650 Flat Top
• Positive Terminal: Flat Top
• Nominal Capacity: 2500mAh (0.2C discharge)
• Nominal Voltage: 3.6V – 3.7V
• Full Charge Voltage: 4.20V ± 0.05V
• Discharge Cut-Off Voltage: 2.50V (recommended 3.0V for extended cycle life)
• Continuous Discharge Current (Max): 20A
• Standard Charge Current: 1.25A (0.5C)
• Maximum Charge Current: 4.0A (4000mA)
• Dimensions: Approximately 18.5mm (Diameter) × 65.0mm (Length)
• Cell Weight: Approximately 45.0g
• Applications: Cordless power tools, high-lumen flashlights, electric bicycles, e-scooters, robotics, and custom DIY battery packs

Package Includes

• Samsung INR18650-25R 2500mAh 20A 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 repair, tool battery replacement, or testing
• 10 PCS – Tool Pack Rebuilds: Perfect for rebuilding drill, driver, or garden power tool battery packs
• 20 PCS – High-Power Modules: Ideal for 36V or 48V auxiliary modules, robotics, and DIY power packs
• 50 PCS – Mobility & Energy Modules: Tailored for electric bike battery packs, e-scooters, and portable storage modules
• 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 4.20V per cell or discharge below 2.50V per cell.
• Do not exceed the maximum charging current of 4.0A (4000mA).
• Always inspect cell outer shrink wrap, insulator ring, and terminals for damage before use; rewrap immediately if damaged.
• Never carry loose 18650 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, and avoid temperatures exceeding 60°C.
• 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-charge, over-discharge, and balance protection.

Why Choose DXF?

• Genuine Grade-A Samsung SDI 25R cells with true 2500mAh high-drain performance
• Reliable 20A continuous discharge rating under demanding power requirements
• Carefully matched batches for balanced series and parallel pack assembly
• Strict pre-shipment quality inspection and secure protective packaging
• Global warehouse logistics network and responsive technical customer support

Perfect For

Engineered for contractors, DIY builders, and electronics enthusiasts looking for proven, dependable 20A continuous power and 2500mAh capacity for cordless power tools, flashlights, electric transport, and custom battery packs.

Power your projects with trusted Samsung 18650 performance. Learn more about setups and battery care on the DXF YouTube channel.