NCR18650B Battery Explained: Uses, Specs, Lifespan

Among the many types of 18650 lithium-ion cells, the NCR18650B has emerged as one of the most popular and trusted choices for low to medium drain applications.

But what exactly is the NCR18650B battery? What makes it different from other 18650 batteries? And where can you find a trusted supplier for it?

This article offers a comprehensive overview of the NCR18650B battery, including its specifications, benefits, common applications, and buying tips — with a special look at custom battery solutions provided by Ufine Battery, a leading lithium battery manufacturer based in China.

Part 1. What is the NCR18650B battery?

The NCR18650B is a high-capacity 18650-format lithium-ion cell originally developed by Panasonic/Sanyo. The name follows the standard lithium battery naming convention:

• “NCR” – Refers to the battery chemistry (Lithium Nickel Cobalt Aluminum Oxide, or NCA)
• “18” – 18mm diameter
• “65” – 65mm length
• “0” – Cylindrical cell

The NCR18650B stands out for offering one of the highest capacities (around 3400mAh–3500mAh) in the 18650 class, making it an ideal choice for applications where runtime and energy density are more critical than maximum discharge rate.

Part 2. NCR18650B technical specifications

Here are the key specifications that define the performance of the NCR18650B:

SpecificationDetailsNominal Voltage3.6V / 3.7VTypical Capacity3400–3500mAhMax Continuous Discharge4.9A (with external protection)Standard Charge Current0.5CMax Charge Voltage4.2VCut-off Voltage2.5VChemistryLiNiCoAlO2 (NCA)Cycle Life~500–1000 cycles (with proper use)Diameter18.6 mmHeight65.2 mmWeight~47 grams

The NCR18650B is known for its stable output, long-lasting charge, and high energy density, but it’s not intended for high-drain devices like e-cigarettes or high-performance electric tools.

Part 3. Advantages of the NCR18650B battery

✅ High Energy Density

With up to 3500mAh capacity, it offers longer run times than most 18650 cells, making it ideal for energy storage and portable electronics.

✅ Long Cycle Life

The NCR18650B can deliver up to 1000 charge cycles under optimal conditions, providing long-term value for consumers and businesses.

✅ Reliable Chemistry

NCA chemistry combines high energy with good thermal stability, offering a balance between safety and performance.

✅ Trusted Brand & Compatibility

Originally manufactured by Panasonic/Sanyo, the NCR18650B is widely supported in BMS systems and compatible with many devices and packs.

Part 4. Limitations and considerations

Despite its strengths, the NCR18650B isn’t suitable for every application. Consider these points:

• Low Discharge Limit: The maximum discharge rate is around 4.9A, which is lower than high-drain 18650 batteries like the Samsung 25R (20A).
• Requires Protection Circuit: To prevent overcharge, over-discharge, or short circuits, the battery often needs to be paired with a protection circuit module (PCM).
• Storage and Temperature Sensitivity: Like most lithium-ion batteries, performance can degrade under high heat or freezing conditions.

For safety and longevity, proper handling, charging, and storage are essential.

Part 5. NCR18650B battery types: protected vs button top

The NCR18650B comes in a few different variants tailored for different applications:

NCR18650B Protected

This type includes an internal protection circuit to safeguard against overvoltage, undervoltage, and short circuits. It’s commonly used in devices that don’t have built-in battery management.

NCR18650B Button Top

This version has a raised positive terminal, making it easier to fit in devices that require a button top instead of a flat top. Often combined with protection circuitry, it’s popular in flashlights, meters, and other consumer electronics.

Flat Top (Unprotected)

This is the raw cell version, typically used in battery packs or devices that already include BMS protection.

When purchasing, it’s important to verify the exact type needed for your device or project.

Part 6. What is the lifespan of the NCR18650B battery?

The lifespan of the NCR18650B battery depends on usage conditions, but under normal circumstances:

• It can deliver around 500 to 1000 charge/discharge cycles.
• If used conservatively (e.g., avoiding deep discharges or excessive heat), users can see over 2–3 years of life.
• Capacity retention typically drops to 80% after 300–500 cycles.

Proper care — including not overcharging, avoiding full discharge, and storing at 40–60% charge in cool temperatures — can greatly extend the battery’s usable life.

Part 7. Common applications of the NCR18650B

Thanks to its high capacity and reliable performance, the NCR18650B is widely used in:

• Flashlights and Headlamps
• Power Banks and USB Battery Packs
• Medical Equipment
• Laptop Battery Packs
• Solar-Powered Devices and Energy Storage
• Electric Bicycles (for lower current draws)

Its consistent output and long runtime make it ideal for devices requiring sustained, moderate power.

Part 8. NCR18650B vs other 18650 batteries

Let’s compare the NCR18650B with some common alternatives:

BatteryCapacityMax DischargeBest ForNCR18650B~3400mAh~4.9ALow-drain, long runtimeSamsung 25R~2500mAh20AHigh-drain applicationsLG MJ1~3500mAh10ABalanced performanceSony VTC6~3000mAh15APower tools, e-bikes

While the NCR18650B shines in capacity, it’s not meant for high-amperage applications. Choose based on your project’s current draw and runtime requirements.

Part 9. Genuine vs fake NCR18650B: How to spot the difference

Due to its popularity, the NCR18650B is frequently counterfeited, leading to performance and safety risks. Here’s how to verify authenticity:

Visual Inspection

• Check for accurate labeling and spelling.
• Verify the QR code or laser-etched code (on genuine cells).
• Watch for obvious differences in color, finish, or font.

Measure the Weight

• Real NCR18650Bs weigh about 47g. Fakes are often lighter (40g or less) due to inferior materials.

Capacity Testing

• Use a battery analyzer to check real-world capacity.
• A genuine NCR18650B should show at least 3200–3400mAh.

Buy from Trusted Sources

Avoid buying from unknown or non-certified vendors. Stick with verified suppliers who provide test reports, certificates, and batch traceability.

Part 10. Where to buy NCR18650B batteries

Whether you’re purchasing for DIY use or mass production, here’s what to look for in a supplier:

✅ Quality Assurance

• Batteries should pass capacity, voltage, and internal resistance tests.
• Request certifications: UN38.3, MSDS, RoHS, etc.

✅ Customization Support

If you’re building custom packs, work with a supplier who can design battery solutions based on your voltage, current, form factor, and safety needs.

✅ Technical and After-Sales Support

Choose suppliers who offer responsive support and documentation to help you integrate and maintain the batteries properly.

Part 11. Ufine Battery: trusted NCR18650B and custom lithium battery supplier

If you’re sourcing NCR18650B batteries or looking for custom lithium battery solutions, Ufine Battery is your go-to partner.

Why choose Ufine?

• Wide product range: From 18650 cells to LiFePO4, high-rate, ultra-thin, and high-temperature lithium batteries.
• Customization available: Voltage, size, capacity, discharge rate, and protection circuitry tailored to your needs.
• Strict quality control: Each battery is tested for safety, consistency, and compliance.
• Global delivery & documentation: Full certification support for export and logistics.

Whether you’re building a battery pack for consumer electronics, medical devices, or industrial tools, Ufine can deliver solutions that meet your exact requirements.

Ready to source NCR18650B batteries or design a custom solution?

Contact us today to get started.

Part 12. Conclusion

The NCR18650B battery is a powerhouse when it comes to energy density, stability, and versatility. While it may not suit high-drain applications, its long runtime and proven reliability make it ideal for a wide variety of use cases.

Understanding its specs, recognizing genuine products, and working with a trusted supplier like Ufine Battery ensures you get the most out of this exceptional lithium-ion cell.