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Custom 353027 Mini Round LiPo Battery
The 353027 3.7V 220mAh round lithium polymer battery is a compact rechargeable LiPo pouch cell designed for smart wearable devices, mini electronic products, Bluetooth accessories, and portable IoT applications. With its round-shaped structure, lightweight design, and stable discharge performance, this battery is ideal for products requiring compact and flexible internal layouts.
Manufactured by Lithotop, this round LiPo battery supports customized PCM/BMS solutions, connector configurations, and OEM battery assembly services for various rechargeable electronic projects.
Additional information
| Product Type | Round Li-Polymer battery |
|---|---|
| Model number | 353027 |
| Voltage (Nominal) | 3.7V |
| Capacity (Nominal) | 220mAh |
| Dimensions | 3.5*30*30mm |
| Constant Discharge Current | Typically 0.5C-1C |
| Working Temperature | charge: 0-45℃; discharge: -20-60℃ |
| Certification | ROHS |
Professional Grade A Lipo Battery Solutions
Delivering superior performance consistency and longer cycle life through automated cell matching technology designed for heavy-duty industrial applications.
The 353027 3.7V 220mAh round lithium polymer battery combines compact dimensions with reliable power output for mini electronic devices. Compared with traditional rectangular batteries, the round-shaped pouch-cell structure provides better compatibility for circular or compact product housings.
Produced using high-quality lithium polymer materials and advanced manufacturing technology, this battery offers stable charging and discharging performance, low internal resistance, and reliable cycle life. The battery can also be customized with PCM protection boards, connectors, cables, labels, and packaging solutions according to customer project requirements.
- Compact Round Cell Design
Suitable for smart devices with circular or space-limited internal structures. - 220mAh Stable Capacity
Provides reliable power support for mini portable electronic products. - Lightweight & Slim Structure
Improves portability and internal space efficiency. - Stable Charging & Discharging Performance
Ensures reliable voltage output and long-term operating stability. - Rechargeable & Long Cycle Life
Supports repeated charging cycles with stable performance retention. - Customizable Battery Solution
Supports customized PCM/BMS, connectors, cables, and labels. - Low Internal Resistance
Reduces heat generation and improves energy efficiency.
- Smart wearable devices
- Bluetooth earphones
- Mini GPS tracking products
- Portable healthcare equipment
- Smart IoT devices
- Wireless communication products
- Mini consumer electronics
- Portable monitoring devices
- Smart sensors
- Rechargeable compact electronics
Round Lipo Battery List
| Model | Voltage(V) | Capacity(mAh) | Cell Dimension(T*D)mm | Shape |
|---|---|---|---|---|
| 253027 | 3.7 | 150 | 2.5*30 | Round |
| 253027 | 3.8 | 155 | 2.5*30 | Round |
| 303027 | 3.7 | 180 | 3*30 | Round |
| 303028 | 3.8 | 185 | 3*30 | Round |
| 303535 | 3.8 | 305 | 3*35 | Round |
| 353535 | 3.7 | 365 | 3.5*35 | Round |
| 363027 | 3.8 | 235 | 3.6*30 | Round |
| 403535 | 3.8 | 425 | 4*35 | Round |
| 473027 | 3.8 | 335 | 4.7*30 | Round |
| 503535 | 3.7 | 525 | 5*35 | Round |
| 553535 | 3.7 | 580 | 5.5*35 | Round |
| 603535 | 3.7 | 665 | 6*35 | Round |
| 604543 | 3.7 | 1050 | 6*45 | Round |
| 753535 | 3.85 | 845 | 7.5*35 | Round |
| 755040 | 3.7 | 1500 | 7.5*50*40 | Round |
*Contact us for more Li-Po batteries or customize your special battery!
Customer Development Story
Discover how we helps global customers solve real-world battery challenges through customized lithium battery solutions.
01 – Smart Wearable Device Project from Japan
A Japanese wearable electronics company was developing a compact Bluetooth tracking device with a circular housing structure. During the prototype stage, the customer found that their previous rectangular battery solution wasted internal space and became unstable during vibration testing, causing assembly difficulties and inconsistent product performance.
The customer contacted Lithotop because they needed a more compact round-shaped lithium polymer battery supplier with customization experience. After reviewing the device structure, operating current, and charging requirements, Lithotop engineers recommended the 353027 3.7V 220mAh round LiPo battery with customized PCM protection and optimized cable positioning.
During development, Lithotop adjusted the connector direction, reinforced insulation protection, and optimized wire fixing to improve assembly reliability inside the compact housing.
Sample testing included charging cycle evaluation, vibration testing, runtime testing, and assembly verification. After testing, the customer confirmed improved internal space utilization and more stable product assembly performance.
Before mass production, both teams confirmed samples, connector specifications, PCM consistency, and aging performance. The final product successfully entered stable production and reduced assembly issues during manufacturing.
02 – Portable Bluetooth Accessory Project from Germany
A German consumer electronics company was developing a portable Bluetooth accessory for the European market. Their previous supplier could not provide complete environmental compliance support, creating concerns about product approval and shipment requirements.
The customer approached Lithotop looking for a reliable lithium battery manufacturer with export project experience. After evaluating the product structure and power requirements, Lithotop recommended the 353027 3.7V 220mAh round LiPo battery with optimized PCM parameters and reinforced cable protection.
During development, Lithotop adjusted the insulation structure and connector fixing method to improve transportation reliability and assembly consistency.
Sample testing included charging stability testing, runtime evaluation, transportation simulation, and drop testing. After testing, the customer confirmed more stable battery performance and improved product reliability.
Before mass production, both teams confirmed incoming inspection standards, sample consistency, packaging reliability, and connector specifications. During mass production cooperation, Lithotop also supported the customer with RoHS certification documentation for European environmental compliance requirements.
The final product successfully entered stable large-volume production, helping the customer improve product approval efficiency and reduce shipment risks for the European market.
More Customer Cooperation Cases
Powering leading batteries across wearables, medical devices, IoT, and consumer electronics in 30+ countries..
Smart Bands
A European wearable technology company was developing a new smart fitness band with strict requirements for battery thickness, cycle life, and safety. Their device needed a lightweight LiPo battery that could fit into a compact wristband while support monitoring and Bluetooth connectivity.
Portable Medical Monitor
A startup company focusing on smart health products needed a flexible battery solution for their next-generation fitness monitoring wearable. The device design was slim and curved, requiring a customized LiPo battery with precise dimensions and stable charging performance.
Portable Translator
A customer from Asia was developing a portable AI translation device for travel and business communication. The product required a battery with stable voltage output, compact size, and long standby performance to support voice processing and wireless transmission.
Handling Precautions & Guidelines
Find answers to the most common questions about ordering, shipping, certifications, and working with lithotop as your battery partner.
Engineer’s will make inner BOM according to your confirmed samples. And our quality control teams continuously monitor the entire manufacturing process to ensure the each mass production is the same as samples.
LithoTop specializes in custom lithium battery solutions, including LiPo batteries, Li-ion battery packs, LiFePO4 batteries, high-rate drone batteries, curved batteries, ultra-thin batteries, and custom rechargeable battery packs for industrial and consumer applications.
LithoTop focuses on: Custom battery solutions for special applications, own developed PCB/PCM to help you with Competitive factory-direct pricing, Experience with difficult battery projects such as curved, ultra-thin, and high-discharge batteries. Long-term cooperation support for startups and established brands.
Yes. LithoTop provides fully customized battery solutions based on your device requirements, including voltage, capacity, discharge rate, dimensions, connector type, PCM/BMS protection, and special shapes such as curved or ultra-thin batteries.
Standard samples are usually available quickly about 3-7 days, while custom battery projects typically require evaluation, engineering confirmation, prototyping, and testing. The timeline depends on battery specifications, and certification requirements. Mass order is about 30 working days.
Depending on the product and project requirements, LithoTop batteries can support certifications including UN38.3, MSDS, CE, RoHS, IEC62133, UL , and other transportation or safety compliance documents.
MOQ depends on the battery model and customization level. Standard batteries may support lower quantities like 100pcs, while fully customized battery projects usually require a development MOQ. LithoTop supports both prototype projects and mass production orders.
LithoTop follows strict quality control procedures including: Incoming material inspection, Cell matching and grading Capacity, and voltage testing, Aging and performance tests, 100% Safety inspections before shipment. Quality consistency is critical for battery reliability and long-term cooperation.
Normally, we ship our batteries via DHL, UPS, FedEx, air freight, or sea , depending on order size, destination, and customer preference.
LithoTop is a professional lithium battery manufacturer with production experience in custom battery development and assembly. We provide direct factory support, engineering assistance, quality control, and customized battery solutions for global customers. We wecome you to visit our factory.
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Our Factory Insight
LithoTop operates advanced lithium battery manufacturing facilities equipped with automated production lines, precision testing equipment, and strict quality control systems. From cell selection to battery assembly and final inspection, every process is carefully managed to ensure stable performance, reliable quality, and high production efficiency. With experienced engineers and strong OEM/ODM capability, we provide customized battery solutions for customers worldwide.
Industry News Insight
Stay updated with the latest lithium battery industry news, product innovations, technology insights, and application trends from LithoTop. Explore expert articles, battery guides, and industry updates to learn more about custom lithium battery solutions, energy storage, UAV batteries, wearable device batteries, and advanced power technologies.
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