Why Battery Swelling Happens in Wearable Devices?
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The 012323 3.7V 30mAh Ultra Thin Battery is a miniature rechargeable lithium polymer battery designed for ultra-slim electronic devices that require compact size, lightweight structure, and stable power output. With a 3.7V nominal voltage and 30mAh capacity, this battery is suitable for smart cards, electronic tags, wearable sensors, medical patches, smart labels, Bluetooth accessories, and other space-limited rechargeable electronics.
As a professional lithium polymer battery manufacturer, LithoTop provides customized ultra thin battery solutions.
| Product Type | Ultra thin lipo battery |
|---|---|
| Model number | 012323 |
| Voltage (Nominal) | 3.7V |
| Capacity (Nominal) | 30mAh |
| Dimensions | 1.0±0.2*23±0.5*23±0.5mm |
| Constant Discharge Current | Typically 0.5C-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 012323 3.7V 30mAh ultra thin battery is engineered for devices where battery thickness and footprint are critical design factors. Compared with conventional small LiPo batteries, this ultra-thin battery is more suitable for card-shaped products, compact wearable devices, and electronic modules that cannot accept bulky battery structures.
With 30mAh capacity, this battery is designed for low-power electronics, short wireless communication, standby operation, sensor activation, and compact rechargeable systems. It provides a practical power solution for product developers who need a very thin battery without using a disposable primary battery.
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 | Cell size(T*W*L)mm |
|---|---|---|---|
| 042040 | 3.7 | 8 | 0.4*20*40 |
| 042255 | 3.7 | 24 | 0.4*22*55 |
| 062550 | 3.7 | 40 | 0.6*25*50 |
| 072738 | 3.8 | 38 | 0.7*27*38 |
| 084545 | 3.7 | 110 | 0.8*45*45 |
| 012323 | 3.7 | 30 | 1*23*23 |
| 013040 | 3.7 | 80 | 1*30*40 |
| 013050 | 3.7 | 100 | 1*30*50 |
| 014348 | 3.7 | 130 | 1*43*48 |
| 014460 | 3.7 | 180 | 1*44*60 |
| 015253 | 3.7 | 180 | 1*52*53 |
| 015362 | 3.7 | 250 | 1*53*62 |
| 123030 | 3.7 | 80 | 1.2*30*30 |
| 126070 | 3.7 | 300 | 1.2*60*70 |
| 132939 | 3.7 | 90 | 1.3*29*39 |
| 153040 | 3.7 | 110 | 1.5*30*40 |
| 155075 | 3.7 | 350 | 1.5*50*75 |
| 155776 | 3.7 | 480 | 1.5*57*76 |
| 163050 | 3.7 | 160 | 1.6*30*50 |
| 191622 | 3.7 | 35 | 1.9*16*22 |
*Contact us for more Li-Po batteries or customize your special battery!
Discover how we helps global customers solve real-world battery challenges through customized lithium battery solutions.
A French security technology company was developing a rechargeable smart card used for identity authentication and secure access control. The card needed to remain very thin while powering a small chip, indicator circuit, and short authentication operation. Their previous battery option was too thick, which caused bending issues during card assembly.
The customer contacted LithoTop because they needed an ultra thin rechargeable battery that could fit inside a card-shaped structure without increasing the final product thickness. LithoTop reviewed the card layout, battery cavity, operating current, charging method, standby time target, and lamination process.
After evaluation, LithoTop recommended the 012323 3.7V 30mAh Ultra Thin Battery. Our engineering team judged that the 30mAh capacity was suitable for the card’s low-power usage pattern, while the ultra-thin pouch design could better match the customer’s mechanical structure.
During sample development, LithoTop optimized the tab direction, cable position, outer insulation, and packaging method to reduce assembly pressure inside the card. Sample testing included thickness verification, capacity testing, standby simulation, pulse discharge testing, charging compatibility checking, and installation fit validation.
Before mass production preparation, both teams confirmed samples, battery thickness tolerance, packaging requirements, and inspection standards. The final solution helped the customer keep the smart card slim while achieving stable rechargeable performance. For the customer, this reduced mechanical failure risk and improved confidence during product validation.
A US medical electronics company was developing a lightweight wearable patch for short-term health data monitoring. The device required power for a sensor module, data storage chip, and occasional wireless data transmission. The main challenge was comfort: the patch had to stay thin and flexible enough for daily wearing.
The customer approached LithoTop after testing several small batteries that provided enough capacity but made the patch too bulky. They needed a battery manufacturer that could help balance thickness, capacity, and reliable discharge performance.
LithoTop analyzed the patch’s working current, transmission current peak, target wearing time, charging circuit, enclosure material, and battery placement. Based on this evaluation, LithoTop recommended the 012323 3.7V 30mAh ultra thin battery as a compact rechargeable power source for the prototype.
During prototype development, LithoTop adjusted the battery insulation method, cable outlet direction, wire length, and protection option to match the customer’s patch structure. Sample batteries were tested through sensor operation simulation, wireless pulse testing, voltage stability checking, charge-discharge cycling, storage testing, and installation fit verification.
Before production approval, the customer confirmed the sample performance, battery thickness, packaging method, and incoming inspection standard. The final battery solution helped the medical patch maintain a thinner and more comfortable structure. For the customer, this improved user comfort, reduced design conflict, and supported smoother wearable medical product development.
Ultra thin lithium polymer batteries require precise control over thickness, capacity consistency, sealing reliability, voltage stability, internal resistance, and mechanical tolerance. For slim products, even a small difference in battery thickness, wire direction, or tab position may affect final product assembly.
LithoTop supports customers from early sample evaluation to mass production with professional engineering support and strict quality inspection. Our team can help evaluate battery thickness, product structure, runtime target, charging method, and real application conditions before confirming the final 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.
No. This battery is mainly designed for low-power and space-limited devices. For products requiring high current output, LithoTop can recommend other high-rate LiPo battery models.
Explore more customized lithium battery solutions from LithoTop
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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