Why Battery Swelling Happens in Wearable Devices?
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The 180715 3.8V 8mAh 5C Thin LiPo Battery is an ultra-miniature battery designed for extremely compact electronic devices that require thin structure, lightweight design, and stable power output. With a 3.8V high-voltage platform, and 5C discharge capability, this battery is suitable for smart cards, electronic tags, wearable sensors, smart labels, miniature Bluetooth devices, and other space-limited rechargeable electronics.
As a professional lithium polymer battery manufacturer, LithoTop provides customized thin LiPo battery solutions, including cell size customization, labels, packaging, and OEM/ODM battery pack assembly.
| Product Type | Ultra thin lipo battery |
|---|---|
| Model number | 180715 |
| Voltage (Nominal) | 3.8V |
| Capacity (Nominal) | 8mAh |
| Dimensions | 1.8±0.2*7±0.5*15±0.5mm |
| Constant Discharge Current | 5C |
| 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 180715 3.8V 8mAh 5C thin LiPo battery is engineered for products where battery size and thickness are extremely critical. Compared with conventional small lithium polymer batteries, this miniature thin pouch cell is easier to integrate into ultra-compact devices, smart card modules, slim wearable products, and low-power electronic systems.
Although the capacity is only 8mAh, the 5C discharge capability allows the battery to support short current pulses for low-power wireless communication, sensor activation, chip operation, LED indication, or standby backup functions. The 3.8V high-voltage platform helps provide better usable energy in a very limited 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 | 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 German security technology company was developing a rechargeable smart security card for identity verification and controlled access. The card needed to remain extremely thin while powering a small authentication chip, indicator circuit, and short activation function. The customer’s earlier battery option was too thick and created uneven pressure during card lamination.
The customer contacted LithoTop because they needed an ultra-miniature rechargeable battery that could fit inside a slim card structure without affecting the final card profile. LithoTop reviewed the card layout, battery cavity, operating current, activation cycle, charging method, standby target, and assembly process.
After evaluation, LithoTop recommended the 180715 3.8V 8mAh 5C Thin LiPo Battery. Our engineering team judged that the 8mAh capacity was suitable for the customer’s low-power usage pattern, while the 5C discharge capability could support short authentication pulses. The 3.8V platform also helped improve usable energy within the very limited battery volume.
During sample development, LithoTop optimized the tab direction, wire position, outer insulation, and packaging method to reduce assembly stress inside the card. Sample testing included thickness verification, capacity testing, pulse discharge checking, standby simulation, charging compatibility testing, and installation fit validation.
Before mass production preparation, both teams confirmed samples, battery thickness tolerance, labeling details, packaging requirements, and inspection standards. The final solution helped the customer keep the security card thin while achieving stable rechargeable performance. For the customer, this reduced assembly risk and improved confidence during product validation.
A Japanese medical electronics company was developing a miniature sensor patch for short-term health data collection. The patch needed to power a small sensing circuit, data storage chip, and occasional signal transmission while remaining thin and comfortable on the skin. The main challenge was that the available space for the battery was extremely limited.
The customer approached LithoTop after testing several small batteries that were either too large or unable to provide stable pulse output. They needed a battery manufacturer that could balance thin structure, low capacity, discharge response, and production consistency.
LithoTop analyzed the patch’s sensor current, transmission pulse current, target wearing time, charging method, enclosure material, and battery placement. Based on this evaluation, LithoTop recommended the 180715 3.8V 8mAh 5C thin LiPo battery as a compact rechargeable power source.
During prototype development, LithoTop adjusted the battery insulation method, cable outlet direction, wire length, and protection option to match the customer’s thin 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 sample performance, battery thickness, packaging method, and incoming inspection standard. The final battery solution helped the medical sensor patch maintain a thinner and more comfortable structure. For the customer, this improved user comfort, reduced mechanical design conflict, and supported smoother wearable medical product development.
Miniature thin LiPo batteries require precise control over battery thickness, sealing reliability, voltage consistency, internal resistance, tab position, cable direction, and mechanical tolerance. For ultra-small products, even a slight change in battery size, wire outlet, or protection circuit position may affect final 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, working current, 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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