BAK N18650COP 18650 2500mAh 30A Battery

Professional technical product description BAK N18650COP 186502500mAh / 30A High-drain 2.5Ah 18650 lithium-ion cell engineered for applications that prioritize current delivery, moderate capacity, and compact cylindrical pack integration.  30A Continuous Discharge 2500mAh Nominal Capacity 3.6V Nominal Voltage 18650 Form Factor Unprotected Flat Top 30AMax Continuous Discharge 2500mAhNominal Capacity 2400mAhMinimum Capacity 6AMax Charge Current ≤16mΩAC Impedance @ 1kHz 18.55 × 65.10mmMax Cell Envelope BAK N18650COP 18650 2500mAh 30A Battery This cell sits in the high-power side of the 18650 category. Compared with higher-capacity energy cells, the N18650COP trades runtime for stronger current delivery and lower relative voltage sag under heavy load. That makes it useful for compact tools, mobility packs, robotics, lighting, and custom assemblies that demand a true 30A-class 18650 format. In practical design terms, the N18650COP is best viewed as a power-focused cylindrical cell rather than a maximum-runtime cell. Its useful selection advantage appears when the design objective is peak current capability, lower pack parallel count, or better high-load behavior per cell. Brand / Model BAK / N18650COP Cell Type 18650 cylindrical lithium-ion rechargeable cell Nominal Capacity 2500mAh Minimum Capacity 2400mAh Nominal Voltage 3.6V Charge Cut-Off Voltage 4.20V Discharge Cut-Off Voltage 2.50V Standard Charge Method 1.25A CC/CV to 4.2V, terminate at 100mA Max Continuous Charge 6A at 25°C Max Continuous Discharge 30A at 25°C Charge Temperature 0°C to 50°C Recommended recharge release ≤45°C Discharge Temperature -20°C to 75°C Recommended re-discharge release ≤50°C Internal Resistance ≤16mΩ AC impedance at 1000Hz Dimensions 18.55mm max diameter × 65.10mm max length (with tube) Weight ≤48g Protection No — unprotected bare cell Electrical operating envelope at a glance. These quick-reference visuals summarize how the cell behaves in relation to current, voltage window, capacity-to-energy translation, and C-rate interpretation. 1. Current Capability Stack A simple comparison of key current reference points for charging, standard testing, and full continuous discharge. 30A 20A 10A 6A Max continuous discharge Mid-load reference Rate-test reference Max charge Current (A) 2. Voltage Operating Window Recommended pack logic should keep the cell within this basic CC/CV charge and discharge range. 2.5V 4.2V Usable operating band Discharge cut-off Charge cut-off Nominal cell voltage: 3.6V 3. Capacity and Energy Translation Capacity is stated in amp-hours, while energy depends on nominal voltage. Capacity 2.5Ah Voltage 3.6V Nominal Energy ≈ 9.0Wh × = 4. C-Rate Conversion For a 2500mAh cell, C-rate helps convert current into a normalized loading level. Current 1C ≈ 2.5A 10A ≈ 4C discharge reference 20A ≈ 8C high-load condition 30A ≈ 12C full continuous discharge rating 1.25A ≈ 0.5C standard charge method 6A ≈ 2.4C maximum continuous charge High-current output should be evaluated with voltage sag and heat rise in mind. BAK specifies relative discharge capability at 10A, 20A, and 30A using a 2.5V cut-off. The published criteria indicate that the cell retains at least 95% relative capacity at 20A and 90% relative capacity at 30A when referenced back to the 10A result. That is a good indicator that the cell is genuinely intended for high-load service. The simplified discharge graph below is intentionally presentation-friendly: it visualizes voltage versus capacity under 10A, 20A, and 30A loading so shoppers can quickly understand the trade-off between current, voltage sag, and delivered capacity. Relative rate capability summary 10A / 10A 100% relative capacity 20A / 10A ≥95% relative capacity 30A / 10A ≥90% relative capacity Interpretation The cell holds a strong fraction of its low-rate capacity even under heavy 20A–30A loading, which is the hallmark of a power-oriented 18650. 5. Simplified Discharge-Curve Graph Voltage vs. capacity illustration under 10A, 20A, and 30A constant-current discharge. Simplified for product-page visualization. 4.2V 3.9V 3.6V 3.3V 3.0V 2.7V 2.5V 0 600 1200 1800 2400 mAh Capacity delivered Cell voltage 10A reference 20A high load 30A max cont. 6. Estimated IR Voltage Drop Using the specification limit of ≤16mΩ AC impedance as a fast order-of-magnitude planning reference. V_drop ≈ I × R At 30A and 16mΩ: 0.48V estimated internal drop At 20A and 16mΩ: 0.32V estimated internal drop Lower real-world impedance can improve sag behavior Pack busbars, welds, holders, and BMS also add resistance Thermal conditions strongly affect charge acceptance, discharge performance, and aging. The specification includes charge limits, discharge temperature limits, a relative low/high temperature discharge table, and a storage-performance criterion after hot storage. These are especially useful for pack designers and system integrators. 7. Charge Profile Reference Standard charge method: 1.25A CC/CV to 4.2V, terminate at 100mA. Max continuous charge is 6A. CC stage CV hold @ 4.2V Current tapers to 100mA Voltage / current Charge time progression Start Constant current Constant voltage 8. Thermal Operating Envelope Published operating ranges with recommended thermal release thresholds. Charge: 0°C to 50°C Discharge: -20°C to 75°C ≤45°C recommended recharge release ≤50°C recommended re-discharge release System thermal management should be based on measured cell-surface temperatures. 9. Temperature Characterization Families Relative discharge capacity at 10A versus ambient test temperature. -20°C -10°C 0°C 25°C 60°C 100% 80% 70% 60% Relative capacity Test temperature 10. Cycle-Life Visualization Published room-temperature cycle criterion under 4A charge and 30A discharge with 75°C temperature cut-off. 60% capacity line ≥1450mAh after 301 cycles 0 100 200 301 400 100% 80% 70% 60% Cycle count Relative capacity Storage-performance note: after storage at 60±5°C for 28 days, the specification requires a recovery capacity ≥90% relative to initial capacity. This is a useful indicator for inventory and thermal-storage robustness, though long-term storage is still best managed at cooler conditions and partial state of charge. 18650 dimensional envelope for holders, sleds, weld fixtures, and pack CAD. Mechanical fit is especially important in dense assemblies. The manufacturer dimension is specified with tube, so the diagram below should be treated as a maximum envelope reference for compatibility planning. 11. Cell Dimension Diagram Mechanical envelope based on the published specification dimensions. 65.10mm max 18.55mm max Cylindrical cell with outer tube / wrap included in stated envelope Always confirm real fit in holders, chargers, and welded pack fixtures. 12. Pack Scaling Formulas Quick math for designers building series/parallel battery packs. Pack Voltage ≈ Series Count × 3.6V Pack Capacity ≈ Parallel Count × 2.5Ah Pack Energy ≈ S × P × 9.0Wh Pack Current Capability ≈ Parallel Count × 30A 13. Example Parallel Scaling Approximate scaling, assuming balanced cells and proper thermal/electrical design. 1P 2.5Ah, 9.0Wh, 30A 2P 5.0Ah, 18.0Wh, 60A 3P 7.5Ah, 27.0Wh, 90A 4P 10.0Ah, 36.0Wh, 120A 5P 12.5Ah, 45.0Wh, 150A 14. Common Series Voltage Examples Nominal voltage examples only. Full-charge and cut-off pack voltages scale separately. 1S 3.6V nominal 3S 10.8V nominal 4S 14.4V nominal 5S 18.0V nominal 10S 36.0V nominal 13S 46.8V nominal Use the N18650COP inside a controlled electrical and thermal system. This is an unprotected high-power cell. Safe implementation requires a charger/BMS strategy that respects the basic voltage and temperature boundaries, along with pack-level overcurrent and short-circuit protection. 15. Suggested Control Threshold Map System-level control guidance derived from the published operating range. Charge upper limit 4.20V per cell Discharge floor 2.50V per cell Charge temperature gate Allow 0°C to 50°C, with ≤45°C preferred restart threshold Discharge temperature gate Allow -20°C to 75°C, with ≤50°C preferred restart threshold Current control Keep sustained current within system-validated limits, even if cell-level rating is 30A 16. Risk-Control Checklist Recommended pack-building and use practices. Use only in devices or packs designed for lithium-ion cylindrical cells. Do not charge above 4.20V or discharge below 2.50V per cell. Use a charger/BMS that monitors voltage, current, and temperature. Never carry loose cells with conductive objects such as keys or coins. Spot weld for pack assembly; do not solder directly to the cell body. Inspect wraps and insulator rings before use; rewrap damaged cells immediately. Best suited for compact high-load systems where current delivery matters. Power Tools Good fit for compact drills, drivers, and portable tools. Useful where bursts and sustained higher current matter more than max runtime. RC / Robotics Appropriate for motor-driven systems with moderate-to-high current draw. Supports tighter pack layouts thanks to 18650 format familiarity. High-Output Lighting Suitable for demanding multi-emitter or tactical lighting setups. High-drain performance helps reduce sag at elevated output levels. Custom Battery Packs Useful for designers optimizing around current-per-cell and compact packaging. Requires proper cell matching, weld quality, and pack-level protection. E-Bike / Mobility Modules Can support higher-drain mobility designs where cell count and thermal management are properly engineered. Pack architecture should be validated under real load and cooling conditions. ESS / Backup Subsystems More of a power-cell choice than an energy-density choice. Consider higher-capacity cells instead when runtime per cell is the main requirement. 17. Selection Bias: Power vs. Runtime Quick visual positioning of the N18650COP within a common battery-selection framework. More runtime per cell → More power / current → BAK N18650COP Power-focused position Higher-capacity energy cells typically sit further right 18. Application Suitability Matrix Simple product-page fit guidance. Power tools Strong fit Robotics / RC Strong fit High-output flashlights Strong fit General runtime-focused packs Use when current matters Max-energy-per-cell designs Consider higher-capacity energy cells Safety, Handling & Compatibility Notice This product is an unprotected lithium-ion cell. It should only be used by customers who understand cell-level lithium-ion safety and who are using the battery in compatible hardware, managed packs, or professionally designed assemblies. Improper use can lead to overheating, venting, fire, or explosion. Charge only with lithium-ion chargers or managed battery systems designed for the correct chemistry and cell count. Never short circuit, crush, puncture, incinerate, or expose the cell to water. Do not use cells with damaged wraps, dented cans, or missing top insulator rings. Do not mix with cells of different age, capacity, or state of charge in the same pack. For assembly, use spot welding rather than direct soldering to reduce heat damage risk. Store and transport in non-conductive cases; never carry loose cells in pockets or bags. Keep away from children and from applications for which the product is not specified. Not for e-cigarette, vape, or similar use. This page is formatted as a technical, chart-oriented Shopify description and is intended to improve customer understanding. Final device compatibility and safety remain the responsibility of the integrator or end user. Common technical questions about the BAK N18650COP. What is the capacity of the BAK N18650COP? The nominal capacity is 2500mAh, with a published minimum capacity of 2400mAh under the standard charge and discharge test method. What is the discharge rating? The manufacturer specification lists a maximum continuous discharge current of 30A at 25°C, making this a high-drain 18650 cell. Is this a protected battery? No. This is an unprotected bare cell and should be used only in equipment or packs with appropriate electrical and thermal protection. What charger should be used? Use a charger or battery-management system intended for single-cell or multi-cell lithium-ion packs that charges to 4.20V per cell using a CC/CV profile. What is the correct discharge cut-off voltage? The specification states a 2.50V discharge cut-off voltage per cell. In many real products, designers use a slightly higher system cut-off to reduce stress and prolong service life. Can the N18650COP be used in battery packs? Yes. It is a strong candidate for custom battery packs where current capability is important. Proper cell matching, spot welding, protection electronics, and thermal validation are required. Can I solder wires directly to this cell? Direct soldering is not recommended. Spot welding is the preferred assembly method because it reduces the risk of overheating the cell. What are the cell dimensions? The published maximum dimensions are 18.55mm diameter and 65.10mm length, with the outer tube included. What temperature range is allowed? The specification lists 0°C to 50°C for charging and -20°C to 75°C for discharging, with recommended thermal release thresholds of ≤45°C for recharge and ≤50°C for re-discharge. Is this cell better for power or runtime? It is primarily a power-oriented cell. If your main priority is higher current output in the 18650 format, it is a strong fit. If maximum runtime per cell is the priority, a higher-capacity energy cell may be more appropriate. What does ≤16mΩ internal resistance mean? It indicates low impedance, which helps support higher current delivery and lower voltage sag. Real-world pack resistance will also include welds, busbars, nickel, holders, wiring, and BMS components. How many cycles should I expect? The published room-temperature cycle criterion states the cell should retain at least 1450mAh after the 301st cycle under the specified 4A charge / 30A discharge test with a 75°C temperature cut-off. Real service life depends heavily on load, temperature, depth of discharge, and charge limits in the final application. Can I carry this battery loose? No. Loose transport is unsafe because metal objects can short the terminals. Always use a non-conductive battery case.