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Product Details

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    Discharge Rate
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    Long Cycle Life
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    Ultra-Low Self-Discharge
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    Wide Temperature Range

Lithium batteries exhibit varying discharge rates. Ufine's batteries support a maximum discharge rate of 5.0C,delivering high power output in short durations.
Ufine's lithium battery maintains over 80% capacity after 500 cycles at room temperature,utilizing 0.5C charge and discharge conditions.
Batteries exhibit differential self-discharge rates at 100% and 70% charge states.
Self-discharge is higher at 100% state of charge (SOC) compared to 70% SOC.
Lithium batteries operate within the -20°C to 60°C discharge temperature range.
Ufine's custom low-temperature batteries can be used for -40°C to 55°C operation, catering to diverse outdoor scenarios.

Thorough Capacity Testing

Each Ultra-Thin Battery undergoes meticulous capacity testing before shipment, validating normal parameters encompassing voltage, current, charging, and discharging data for consistent performance.


Environmental Consciousness

Utilizes premium A-grade battery cells, ensuring leak-proof and environmentally friendly operations, aligning with sustainable practices.


Ufine's special-shaped batteries are not just curved batteries, but can also be customized with batteries of various shapes for your special equipment, such as fan-shaped batteries, polygonal batteries, etc.


Smart Ring

Battery Specification

  • 1. Mechanical Characteristics

    Cell 150732 PCM No
    NTC No Weight appr. 0.52g
    Configuration 1S1P
  • 2. Electrical Specification

    Capacity 20mAh Nominal Voltage 3.7V
    Energy 0.074Wh Internal Resistance less than 1000mΩ
    Max. Charge Voltage 4.2V Discharge Cut Off 2.75V
    Max. Charge Current 20mA Max. Discharge Current 20mA
    Standard Charge Current 10mA Standard Discharge Current 10mA
    Charging Temperature 0℃ to 45℃ Discharging Temperature -20℃ to 60℃
    Storage Temp.Range 1 year at -20℃ to +30℃ 3 mos. at -20℃ to +45℃ 1 mo. at -20℃ to +60℃ Cycle life 100 cycles ≥92% 300 cycles ≥88% 500 cycles ≥80%
  • 3. Cell protection

    Overcharge Detection NoOverdischarge Detection No
    Overcurrent Detection No Short protection No
Download Product Datasheet

Lipo Battery Cell Capacity Fast Calculator

Please enter your battery information to calculate the battery capacity and energy.

The capacity calculated by this tool is only an approximate value. If you need an accurate assessment, please contact our professional engineers.

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3.7 V 20mAh Special Shaped Battery Application

Wearable Device

One of the primary applications of 3.7 V 20mAh curved polymer batteries is in wearable technology. Devices such as smart ring, smartwatches, fitness trackers, and health monitoring devices benefit greatly from the battery’s compact size and flexibility.

Smartwatches and Fitness Trackers: These devices require small, lightweight batteries that can fit into slim profiles while providing enough power to run various sensors and connectivity features.

Health Monitoring Devices: Continuous health monitoring devices, like heart rate monitors and glucose sensors, benefit from the reliable and long-lasting power of these batteries.


    Medical Devices

    The medical field increasingly relies on small, portable devices that can be worn or carried by patients. The 3.7 V 20mAh curved polymer battery is ideal for these applications due to its compact size and reliable performance.

    Portable Medical Sensors: These include devices that monitor vital signs and other health metrics, which need to be lightweight and non-intrusive.

    Hearing Aids: Compact and efficient power sources like curved polymer batteries are essential for the unobtrusive design of modern hearing aids.

    Internet of Things (IoT)

    The growth of the Internet of Things (IoT) has led to a surge in the number of small, interconnected devices that require efficient power solutions. The 3.7 V 20mAh curved polymer battery is suitable for many IoT applications due to its flexibility and capacity.

    Wearable IoT Devices: These include smart clothing and accessories that integrate sensors and communication modules, requiring compact and flexible power sources.

    Miniature Sensors: IoT applications often involve deploying numerous small sensors in various environments, where the curved polymer battery can provide reliable power in confined spaces.

    Consumer Electronics

    Beyond wearables and IoT, curved polymer batteries are also used in various compact consumer electronics where space is at a premium.

    Wireless Earbuds: These require small, lightweight batteries that can fit into the earbud casing and provide enough power for extended use.

    Miniature Remote Controls: Compact remotes for devices like drones or smart home systems benefit from the small size and reliable power of curved polymer batteries.

    Understanding 3.7 V 20mAh Curved Polymer Battery

    The development of advanced electronic devices has necessitated innovations in battery technology. Among these innovations is the 3.7 V 20mAh curved polymer battery, designed to meet the power needs of small, flexible, and portable devices.

    Part 1. Key Features of 3.7 V 20mAh Curved Polymer Batteries

    Voltage: 3.7 volts, providing sufficient power for many small electronic devices.

    Capacity: 20mAh, suitable for low-power applications.

    Curved Design: The flexible and curved structure allows it to fit into unconventional spaces, enhancing design possibilities for various devices.

    Part 2. 3.7 V 20mAh Curved Polymer Battery Advantages

    Flexibility: The curved design can conform to different shapes, making it ideal for wearable and compact devices.

    Lightweight: The small capacity and size contribute to the battery’s lightweight nature, which is essential for portable electronics.

    Safety: Polymer batteries are generally safer than traditional lithium-ion batteries, reducing the risk of leaks or explosions.

    Part 3. 3.7 V 20mAh Curved Polymer Battery Application

    Smart Rings and Bracelets

    Fitness Trackers

    Smart Clothing

    Wearable Health Monitors

    Hearing Aids

    Smart Home Sensors

    Wearable IoT Devices

    Miniature Remote Controls

    Part 4. Maintenance and Longevity

    To extend battery life, adhere to recommended usage practices. Avoid complete discharges, which strain the battery, and opt for partial charges instead. Regularly update device firmware or software to ensure optimized battery performance. Keeping batteries at around 50% charge during long-term storage prevents degradation.

    Part 5. Buying Guide and Recommendations

    For reliable and customized solutions, consider sourcing your lithium-ion batteries from Ufine custom battery. Our commitment to quality assurance and tailored battery solutions ensures dependable performance for your specific needs.


    • What are special-shaped lithium batteries?

      Special-shaped lithium batteries are custom-designed batteries that deviate from standard shapes like cylindrical or rectangular. They are tailored to fit specific device requirements, offering unique forms such as curved, triangular, or other complex geometries.
    • What are the advantages of using special-shaped lithium batteries?

      These batteries maximize space utilization in devices, allowing for more compact and efficient designs. They offer flexibility in product development, enabling innovative form factors in modern electronics and wearables.
    • Which devices commonly use special-shaped lithium batteries?

      Special-shaped lithium batteries are commonly used in wearable technology (e.g., smart rings, fitness trackers), medical devices (e.g., hearing aids, health monitors), and compact consumer electronics (e.g., wireless earbuds, smart glasses).
    • Are special-shaped lithium batteries safe?

      Yes, they are designed with safety in mind, incorporating features like overcharge, over-discharge, and short-circuit protection. Manufacturers follow strict safety standards to ensure their reliability and safety.
    • Are special-shaped lithium batteries more expensive?

      Due to the customization and specialized manufacturing processes involved, special-shaped lithium batteries can be more expensive than standard ones. However, the cost is justified by the benefits they provide in design flexibility and space optimization.
    • Where can I purchase special-shaped lithium batteries?

      These batteries are available from specialized battery manufacturers and suppliers. Companies like Ufine Battery, a Chinese custom lithium battery manufacturer, offer a range of special-shaped lithium batteries tailored to various applications.


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    High Energy Density

    It stores large amounts of energy in a smaller and lighter package

    Longer Cycle Life

    Withstands extensive charge and discharge cycles

    Low Self-Discharge

    Maintains power longer when not in use


    Minimizes the risk of accidents and ensures safe operation

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