Why Battery Swelling Happens in Wearable Devices?
I often meet teams after swelling complaints appear. The product looks finished, the launch is…
The 155028 3.8V 14mAh Wearable Battery is designed for compact wearable electronic devices that require thin structure, lightweight design, stable voltage output, and high space utilization. With a 3.8V high-voltage platform and 14mAh capacity, this battery is suitable for wearable sensors, smart patches, electronic wrist tags, biometric modules, compact health devices, smart accessories, and other miniature rechargeable electronics.
As a professional lithium polymer battery manufacturer, LithoTop provides customized wearable battery solutions, including cell size customization, label design, packaging, and OEM/ODM battery pack assembly.
| Product Type | Curved Lipo battery |
|---|---|
| Model number | 155028 |
| Voltage (Nominal) | 3.8V |
| Capacity (Nominal) | 14mAh |
| Dimensions | 1.5±0.2*5.0±0.2*28±0.2mm (R10.7) |
| Constant Discharge Current | Typically 0.2C-1C |
| Working Temperature | charge: 0-45℃; discharge: -20-60℃ |
Delivering superior performance consistency and longer cycle life through automated cell matching technology designed for heavy-duty industrial applications.

The 155028 3.8V 14mAh wearable battery is engineered for small wearable products where internal battery space, thickness, and total device weight are critical design factors. Wearable electronics often require compact rechargeable batteries that can support sensors, MCU control, Bluetooth communication, LED indicators, short vibration feedback, and standby operation within a very limited structure.
With 14mAh capacity, this battery is mainly suitable for low-power wearable devices that require rechargeable power for short activation cycles, periodic sensing, small signal transmission, standby backup, and compact electronic module support. The 3.8V high-voltage platform helps provide improved usable energy within a very small battery volume.
LithoTop applies strict production control during cell selection, capacity testing, voltage inspection, internal resistance testing, thickness checking, aging verification, appearance inspection, and final quality control. These processes help ensure stable battery performance, reliable safety, and consistent mass production quality.


| Model | Voltage(V) | Capacity(mAh) | Cell Size(T*W*L)mm | Shape | Polairty&Direction |
|---|---|---|---|---|---|
| 125034 | 3.7 | 14 | 1.25*5.1*34 | Curve | CD |
| 3.8 | 16 | Curve | |||
| 125625Small 155625 3.8V 14mAh Ring Battery | 3.7 | 10 | 1.25*5.6*25 | Curve | CD |
| 3.8 | 12 | Curve | |||
| 125628 | 3.7 | 12 | 1.25*5.6*28 | Curve | CD |
| 3.8 | 14 | Curve | |||
| 125634 | 3.7 | 15 | 1.25*5.6*34 | Curve | CD |
| 3.8 | 17 | Curve | |||
| 126825126825 3.8V 15mAh Curved LiPo Battery | 3.7 | 13 | 1.25*6.9*25 | Curve | ABCD |
| 3.8 | 15 | Curve | |||
| 120732 | 3.7 | 17 | 1.25*7.1*31 | Curve | ABCD |
| 3.8 | 19 | Curve | |||
| 155028CE 155028 14mAh Wearable Battery | 3.7 | 12 | 1.52*5.1*28 | Curve | CD |
| 3.8 | 14 | ||||
| 155034 | 3.7 | 16 | 1.52*5.1*34 | Curve | CD |
| 3.8 | 18 | Curve | |||
| 155625 | 3.7 | 12 | 1.52*5.6*25 | Curve | CD |
| 3.8 | 14 | Curve | |||
| 155628 | 3.7 | 14 | 1.52*5.6*28 | Curve | CD |
| 3.8 | 16 | Curve | |||
| 155634 | 3.7 | 18 | 1.52*5.6*34 | Curve | CD |
| 3.8 | 20 | Curve | |||
| 156825156825 3.8V 18mAh Smart Ring Battery | 3.7 | 16 | 1.52*6.9*25 | Curve | ABCD |
| 3.8 | 18 | Curve | |||
| 150720 | 3.7 | 12 | 1.52*6.8*20.5 | Curve | ABCD |
| 3.8 | 13 | Curve | |||
| 150732 | 3.7 | 20 | 1.52*7.1*31 | Curve | ABCD |
| 3.8 | 22 | Curve | |||
| 160620160620 3.8V 12mAh Curved Polymer Battery | 3.7 | 11 | 1.6*6*20 | Curve | ABCD |
| 3.8 | 12 | Curve | |||
| 160625160625 3.8V 17mAh Curved Lithium Battery | 3.7 | 15 | 1.6*6*25 | Curve | ABCD |
| 3.8 | 17 | Curve | |||
| 160630160630 3.8V 18mAh Curved Batteries | 3.7 | 18 | 1.6*6*30 | Curve | ABCD |
| 3.8 | 21 | Curve | |||
| 160635 | 3.7 | 25 | 1.6*6*35 | Curve | D |
| 3.8 | 28 | Curve | |||
| 185625 | 3.7 | 17 | 1.8*5.6*25 | Curve | CD |
| 3.8 | 20 | Curve | |||
| 185628 | 3.7 | 19 | 1.8*5.6*28 | Curve | CD |
| 3.8 | 22 | Curve | |||
| 185634 | 3.7 | 23 | 1.8*5.6*34 | Curve | CD |
| 3.8 | 26 | Curve | |||
| 186825 | 3.7 | 22 | 1.8*7*25 | Curve | CD |
| 3.8 | 24 | Curve | |||
| 180732 | 3.7 | 30 | 1.8*7*31 | Curve | CD |
| 3.8 | 34 | Curve | |||
| 210630 | 3.7 | 30 | 2.1*6*30 | Curve | D |
| 3.8 | 33 | Curve | |||
| 210635 | 3.7 | 35 | 2.1*6*35 | Curve | C |
| 3.8 | 38 | Curve |
*Contact us for custom LiPo battery or customize your special battery !
Discover how we helps global customers solve real-world battery challenges through customized lithium battery solutions.
An Austrian sports technology company was developing a smart ski glove sensor used to record hand movement, grip pressure, and short training data during winter sports activities. The electronic module needed to fit inside the glove without affecting flexibility, warmth, or user comfort. The device required power for a small motion sensor, pressure detection circuit, LED status indicator, memory chip, and short wireless data transfer after each training session.
The customer contacted LithoTop because their first battery option was too thick for the glove module and created a hard pressure point near the back of the hand. They needed a miniature rechargeable wearable battery that could provide stable output while keeping the sensor module thin and comfortable. The product was also planned for European sports retail channels, so CE documentation support was required during project preparation.
LithoTop reviewed the sensor board layout, glove module space, standby current, motion sampling cycle, wireless transmission peak, charging method, cable routing, and expected training usage time. After evaluation, LithoTop recommended the 155028 3.8V 14mAh Wearable Battery. Our engineering team judged that the 14mAh capacity was suitable for the customer’s low-power data collection profile, while the 3.8V high-voltage platform helped provide improved usable energy in a very compact cell size.
During sample development, LithoTop optimized the cable outlet direction, wire length, insulation layer, PCM protection option, and label position to match the customer’s glove sensor assembly process. Sample batteries were tested through motion recording simulation, pressure sensor operation, LED indication testing, wireless transfer pulse testing, charging compatibility checking, thickness verification, and installation fit validation.
Because the product was planned for European sales, LithoTop also supported CE documentation preparation for the battery project. Before pilot production, both teams confirmed samples, battery dimensions, CE support documents, packaging requirements, and incoming inspection standards. The final battery solution helped the customer reduce module thickness, improve wearing comfort, and support a smoother CE preparation process for their smart winter sports product.
A Qatar healthcare technology company was developing a rechargeable patient ID wrist tag for hospital wards, rehabilitation centers, and private clinics. The wrist tag needed to power an electronic identification chip, LED confirmation indicator, low-power control circuit, and short-range communication function. The product had to remain lightweight and comfortable because patients might wear it for long periods during check-in, treatment, and monitoring procedures.
The customer approached LithoTop after testing several miniature batteries that could power the prototype but made the wrist tag module too bulky. Their design team wanted the battery to fit beside the PCB without increasing wristband thickness or creating an uncomfortable rigid area. They also needed stable production consistency because the wrist tag housing had very little tolerance for battery size variation.
LithoTop analyzed the wrist tag’s standby current, ID activation cycle, LED indication time, short-range communication peak, and daily hospital usage pattern. Based on this evaluation, LithoTop recommended the 155028 3.8V 14mAh wearable battery as a compact rechargeable power source for the project.
During prototype development, LithoTop adjusted label format, and packaging approach to match the customer’s wrist tag assembly process. Sample batteries were tested through ID activation simulation, LED pulse testing, wireless communication checking, standby evaluation, voltage stability testing, charge-discharge cycling, storage testing, and installation fit review.
Before production approval, the customer confirmed approved sample performance, battery thickness, packaging method, and batch inspection requirements. LithoTop then controlled production according to the confirmed sample and quality standards.
The final battery solution helped the patient ID wrist tag maintain a slim and comfortable structure while supporting reliable rechargeable operation. For the customer, this reduced assembly rejection risk, improved patient wearing comfort, and supported a more practical hospital wearable device for daily healthcare management.
Wearable batteries require more than small size and low weight. Battery development must consider thickness control, capacity consistency, voltage stability, internal resistance, sealing reliability, cable direction, protection circuit position, charging compatibility, and mechanical integration inside the final wearable device.
LithoTop supports customers from early sample evaluation to mass production with professional engineering support and strict quality inspection. Our team can help evaluate wearable product structure, battery cavity, charging method, standby current, wireless transmission peak, sensor load before confirming the battery solution.
Powering leading batteries across wearables, medical devices, IoT, and consumer electronics in 30+ countries..



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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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.
LithoTop provides comprehensive certification support for custom lithium batteries to help customers accelerate product development and global market entry. From prototype verification to mass production, our engineering team assists with battery compliance, transportation documentation, and international safety standards, reducing certification risks and shortening your project timeline.
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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