Description
Experience massive power and capacity with the BAK INR2170-45D, a premium 21700 high-drain cell engineered for extreme applications. This 4-pack delivers an enormous 4500mAh capacity and a true 45A continuous discharge, making it the ideal upgrade for high-wattage vaping, heavy-duty power tools, ultra-bright 21700 flashlights, and high-performance RC models. The flat top design ensures broad compatibility with spring-loaded contacts and simplifies spot-welding for custom battery packs. With ultra-low internal resistance and robust cycle life, the 45D provides sustained, reliable power when your device demands maximum output.
Key Features
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Genuine BAK INR2170-45D Cell – Manufactured by BAK, a leading lithium-ion producer, ensuring consistent quality, safety, and high-rate performance.
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4500mAh Ultra-High Capacity – Significantly extends runtime compared to typical 18650 or 3000mAh 21700 cells; perfect for power-hungry devices that need long-lasting energy.
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45A Continuous Discharge (60A Pulse) – True 45A continuous rating handles extreme loads with ease; pulse capability up to 60A for short bursts. Ideal for power tools, sub-ohm vaping, and direct-drive flashlights.
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Ultra-Low Internal Resistance (≤12mΩ) – Minimizes voltage sag and heat generation under load, delivering immediate throttle response and maintaining peak brightness.
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Flat Top Design – Compatible with all standard 21700 spring-contact devices, chargers, and battery trays. Flat positive terminal ensures reliable spot-welding for DIY pack construction.
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Excellent Energy Density – 21700 format provides a perfect balance of size, capacity, and power output, outperforming most 18650 cells in both runtime and current delivery.
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4-Pack Value – Ideal quantity for dual-battery mods, rebuilding tool packs, or building high-current RC packs. Protective packaging ensures safe delivery.
Parameters
Applications
Recommended For
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High-power vaping: regulated and mechanical mods, sub-ohm tanks with builds safely within 45A continuous limit.
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Cordless power tools: impact drivers, drills, circular saws, and high-torque wrenches when used in properly engineered battery packs with BMS.
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High-output 21700 flashlights: FET-driven or multi-emitter lights requiring sustained current up to 45A for maximum brightness.
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RC models: cars, trucks, boats, and quadcopters that demand high burst current and extended runtimes.
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E-bike and e-scooter battery packs: per-cell discharge within 45A; the high capacity reduces the number of parallel cells needed.
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Portable high-power energy storage: DIY power banks and field power supplies capable of charging laptops and high-wattage devices.
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Garden tools and portable spot welders: any high-drain application where both power and capacity are critical.
Not Recommended For
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Low-power, ultra-long-runtime devices (solar lights, sensors, clocks): the high-rate capability is wasted; choose a 5000mAh low-drain 21700 cell for maximum runtime.
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18650-only devices: the 21700 format is physically larger (21mm x 70mm) and will not fit. Verify your device’s battery compartment size before purchase.
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Standard USB power banks that do not require high current: the 45A performance is unnecessary, and a lower-cost high-capacity cell would be more economical.
FAQ
Q: Is this battery truly rated for 60A?
A: The BAK INR2170-45D has a continuous discharge rating of 45A. The 60A figure refers to a short pulse capability only. For continuous use, you must design your application to stay at or below 45A to ensure safe operation and long cell life. Operating continuously at 60A will cause overheating, severe capacity degradation, and potential safety risks.
Q: Can I use this battery in my 18650 device?
A: No. This is a 21700 cell, which is approximately 21mm in diameter and 70mm in length. It is physically larger than an 18650 (18mm x 65mm) and will not fit unless your device is specifically designed for 21700. Always check your device’s specifications before ordering.
Q: What is the advantage of 21700 over 18650?
A: The 21700 format offers a significant increase in energy capacity and power output without an extreme increase in size. The 45D delivers 4500mAh and 45A, whereas the best 18650 cells typically max out around 3500mAh at 10A, or 3000mAh at 35-40A. This means longer runtime and higher current capability in a single cell.
Q: Does this cell have built-in protection?
A: No, the BAK INR2170-45D is an unprotected flat top cell. This allows unrestricted current flow for high-drain applications. When building multi-cell series or parallel packs, you must use an external BMS (Battery Management System) rated for at least 60A to protect against overcharge, over-discharge, and balancing issues. For single-cell use, ensure your device has its own protection mechanisms.
Q: Can I solder directly onto the battery?
A: Never solder directly onto lithium-ion cell terminals. The heat can damage internal separators and safety vents, leading to permanent damage or dangerous failure. Always use a spot welder to attach nickel strips. For applications requiring wires, spot-weld nickel tabs with pre-soldered leads, or purchase pre-wired cells.
Q: How should I store these batteries when not in use?
A: Store in a cool, dry place at a nominal voltage of 3.6–3.7V (approximately 40-50% state of charge). Avoid storing fully charged or fully discharged for extended periods, as this accelerates aging. Use a non-conductive battery case to prevent accidental short circuits.
