Why Battery Swelling Happens in Wearable Devices?
I often meet teams after swelling complaints appear. The product looks finished, the launch is…
The 180732 3.8V 34mAh Smart Bracelet Battery is designed for compact wearable electronics that require thin structure, lightweight design, stable voltage output, and efficient use of limited internal space. With a 3.8V high-voltage platform and 34mAh capacity, this battery is suitable for smart bracelets, fitness bands, health monitoring wearables, biometric sensors, smart jewelry, and other miniature rechargeable devices.
As a professional lithium polymer battery manufacturer, LithoTop provides customized smart bracelet battery solutions, including battery size optimization, label design, packaging, and OEM/ODM battery assembly according to customer product requirements.
| Product Type | Curved Lipo battery |
|---|---|
| Model number | 180732 |
| Voltage (Nominal) | 3.8V |
| Capacity (Nominal) | 34mAh |
| Dimensions | 1.8±0.2*7±0.2*32±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 180732 3.8V 34mAh smart bracelet battery is engineered for wearable products where battery thickness, weight, and internal layout are critical design factors. Smart bracelets commonly integrate sensors, MCU control, Bluetooth communication, LED indicators, vibration feedback, and charging circuits inside a very small housing, making battery dimensions and output stability especially important.
With 34mAh capacity, this battery is suitable for low-power wearable devices requiring rechargeable energy for periodic sensing, activity tracking, notification functions, short wireless communication, and standby operation. The 3.8V high-voltage platform helps improve usable energy within a compact 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 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 | |||
| 125625Wearable 125625 12mAh 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 | |||
| 155625Small 155625 3.8V 14mAh Ring Battery | 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 | |||
| 150732CE 150732 22mAh Fitness Ring Battery | 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 | |||
| 180732180732 34mAh Smart Bracelet Battery | 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.
A Danish personal wellness technology company was developing a smart bracelet that monitored daily UV exposure for outdoor workers, runners, and travelers. The device needed to power a UV sensor, ambient light sensor, MCU, small LED indicator, vibration alert, and periodic Bluetooth synchronization with a smartphone. The customer wanted the bracelet to remain slim and comfortable enough for continuous outdoor wearing.
Their first prototype used a battery with sufficient electrical performance but too much thickness, causing the rear housing to protrude against the wrist. The customer contacted LithoTop because they needed a smaller wearable battery that could provide enough energy for periodic sensing and alerts while allowing the enclosure to remain flat.
LithoTop reviewed the bracelet’s UV sampling frequency, Bluetooth synchronization interval, vibration alert duration, standby current, charging method, sensor layout, and available battery cavity. After evaluation, LithoTop recommended the 180732 3.8V 34mAh Smart Bracelet Battery. The 34mAh capacity provided a suitable balance between operating time and compact size, while the 3.8V high-voltage platform helped improve usable energy within the limited space.
During prototype development, LithoTop optimized battery position to avoid interference with the UV sensor and charging contacts. Sample batteries were tested through sensor sampling simulation, Bluetooth synchronization cycles, vibration alert testing, standby evaluation, charging compatibility checking, thickness verification, and enclosure fit validation.
Before pilot production, both teams confirmed samples, battery dimensions, charging requirements, packaging method, and incoming inspection standards. The final battery solution helped the customer reduce bracelet thickness while maintaining reliable daily monitoring functions. For the customer, this improved wearing comfort, reduced enclosure redesign work, and supported a smoother transition from prototype to production.
A UAE hospitality technology company was developing a rechargeable electronic bracelet for resorts, water parks, and private clubs. The bracelet combined guest identification, access confirmation, LED status indication, and short-range wireless communication in a waterproof wearable enclosure. The product needed to remain lightweight because guests could wear it throughout an entire day of activities.
The customer’s early design reserved most of the internal space for the antenna and waterproof sealing structure, leaving only a narrow area for the battery. A larger battery increased housing thickness and made the wristband less comfortable, especially for younger users. The customer needed a compact rechargeable battery that could support intermittent electronic functions without forcing a major mechanical redesign.
LithoTop analyzed the bracelet’s standby current, access activation frequency, LED pulse duration, wireless communication load, charging cycle, waterproof enclosure layout, and expected daily usage pattern. Based on this evaluation, LithoTop recommended the 180732 3.8V 34mAh smart bracelet battery as a compact wearable power solution.
During sample development, LithoTop adjusted to match the customer’s waterproof internal structure. Sample batteries were tested through repeated access activation cycles, LED pulse operation, wireless communication testing, standby simulation, voltage stability checking, charging verification, and mechanical fit evaluation after enclosure sealing.
The customer then completed trial deployment at a resort facility and confirmed that the smaller battery structure improved wearing comfort while maintaining the required daily operating functions. Before production approval, both teams finalized the approved sample packaging requirements, and quality inspection standard.
The final battery solution helped the hospitality bracelet maintain a thinner waterproof structure without sacrificing functional reliability. For the customer, this improved guest comfort, simplified enclosure design, and reduced battery-related assembly issues during pilot production.
Smart bracelet batteries require precise control over battery thickness, capacity consistency, voltage stability, internal resistance, sealing reliability, cable direction, protection circuit position, charging compatibility, and mechanical integration. Even a small change in battery dimensions can affect PCB placement, enclosure sealing, sensor layout, and overall wearing comfort.
LithoTop supports customers from prototype development to mass production with professional engineering support and strict quality control. Our team can help evaluate bracelet cavity size, working current, sensor load, Bluetooth transmission peak, charging method, vibration load, and final assembly conditions 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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