Why Battery Swelling Happens in Wearable Devices?
I often meet teams after swelling complaints appear. The product looks finished, the launch is…
Products
502031 400mAh High Voltage Polymer Battery
The 502031 3.85V 400mAh High Voltage Polymer Battery is designed for small electronic devices that require higher energy density, stable voltage output, and longer runtime within limited internal space. With a 3.85V high-voltage platform and 400mAh capacity, this battery is suitable for smart wearables, Bluetooth devices, IoT sensors, smart trackers, portable medical devices, and compact consumer electronics.
As a professional lithium polymer battery manufacturer, LithoTop provides customized 502031 high voltage polymer battery solutions, including connector selection, wire length, PCM protection, NTC, cable direction, labels, shrink wrap, packaging, and OEM/ODM battery pack assembly.
Additional information
| Product Type | High Voltage Lipo Battery |
|---|---|
| Model number | 502031 |
| Voltage (Nominal) | 3.85V |
| Capacity (Nominal) | 400mAh |
| Dimensions | 5.0±0.2*20±0.5*31±2.5mm |
| Constant Discharge Current | Typically 0.5C-1C |
| Working Temperature | charge: 0-45℃; discharge: -20-60℃ |
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 502031 3.85V 400mAh high voltage polymer battery is engineered for compact devices that need more usable energy than standard 3.7V lithium polymer batteries. The 3.85V high-voltage design supports a higher charging platform, helping improve energy density and extend device operating time without significantly increasing battery size.
With 400mAh capacity, this battery provides a practical balance between compact structure, lightweight design, and reliable runtime. It is a suitable choice for product developers who need longer operation time than smaller 250mAh or 300mAh batteries, but still need to keep the product slim and easy to carry.
LithoTop applies strict production control during cell selection, capacity testing, voltage inspection, internal resistance testing, aging verification, appearance checking, and final quality inspection. These processes help ensure stable performance, reliable safety, and consistent mass production quality.
- 3.85V High Voltage Platform
Provides higher energy density compared with standard 3.7V lithium polymer battery designs. - 400mAh Compact Capacity
Offers reliable runtime for small electronic devices without requiring a large battery compartment. - 502031 Slim Polymer Cell Structure
Suitable for compact products with limited internal installation space. - Stable Voltage Output
Helps support reliable operation for Bluetooth modules, sensors, control boards, and wireless systems. - High Energy Density Design
Improves usable energy while helping keep the final device slim, lightweight, and portable. - Low Self-Discharge Performance
Supports better standby performance for smart devices and portable electronics. - Strict Quality Inspection
Each battery is checked for voltage, capacity, internal resistance, appearance, and consistency before shipment.
- Smart wearable devices
- Bluetooth accessories
- Smart tracking devices
- IoT sensor modules
- Portable medical sensors
- Electronic badges
- Smart home controllers
- Wireless communication devices
- Compact beauty devices
- Rechargeable consumer electronics
3.85V High Voltage Lipo Battery
| Model | Voltage(V) | Capacity(mAh) | Cell size(T*W*L)mm | Shape |
|---|---|---|---|---|
| 282223V4 | 3.85 | 160 | 2.8*22*23 | Pouch |
| 300976V4 | 3.85 | 205 | 3*9*76 | Pouch |
| 301522V4 | 3.85 | 120 | 3*15*22 | Pouch |
| 302223V4 | 3.85 | 160 | 3*22*23 | Pouch |
| 361322V4 | 3.85 | 120 | 3.6*13*22 | Pouch |
| 371723V4 | 3.85 | 180 | 3.7*17*23 | Pouch |
| 402228V4 | 3.85 | 360 | 4*22*28 | Pouch |
| 421724V4 | 3.85 | 220 | 4.2*17*24 | Pouch |
| 423030V4 | 3.85 | 470 | 4.2*30*30 | Pouch |
| 481923V4 | 3.85 | 240 | 4.8*19*23 | Pouch |
| 482030V4 | 3.85 | 400 | 4.8*20*30 | Pouch |
| 492026V4 | 3.85 | 340 | 4.9*20*26 | Pouch |
| 492930V4 | 3.85 | 730 | 4.9*29*30 | Pouch |
| 502329V4 | 3.85 | 430 | 5*23*29 | Pouch |
| 502828V4 | 3.85 | 580 | 5*28*28 | Pouch |
| 502833V4 | 3.85 | 750 | 5*28*33 | Pouch |
| 502930V4 | 3.85 | 700 | 5*29*30 | Pouch |
| 502933V4 | 3.85 | 780 | 5*29*33 | Pouch |
| 512930V4 | 3.85 | 710 | 5.1*29*30 | Pouch |
| 522732V4 | 3.85 | 720 | 5.2*27*32 | Pouch |
| 522830V4 | 3.85 | 705 | 5.2*28*30 | Pouch |
| 532626V4 | 3.85 | 480 | 5.3*26*26 | Pouch |
| 542141V4 | 3.85 | 700 | 5.4*21*41 | Pouch |
| 552224V4 | 3.85 | 410 | 5.5*22*24 | Pouch |
| 553535V4 | 3.85 | 1150 | 5.5*35*35 | Pouch |
| 562830V4 | 3.85 | 770 | 5.6*28*30 | Pouch |
| 562833V4 | 3.85 | 800 | 5.6*28*33 | Pouch |
| 562930V4 | 3.85 | 730 | 5.6*29*30 | Pouch |
| 571430V4 | 3.85 | 300 | 5.7*14*30 | Pouch |
| 592930V4 | 3.85 | 750 | 5.9*29*30 | Pouch |
| 601828V4 | 3.85 | 400 | 6*18*28 | Pouch |
| 602133V4 | 3.85 | 550 | 6*21*33 | Pouch |
| 602533V4 | 3.85 | 780 | 6*25*33 | Pouch |
| 602830V4 | 3.85 | 750 | 6*28*30 | Pouch |
| 602931V4 | 3.85 | 880 | 6*29*31 | Pouch |
| 603040V4 | 3.85 | 1200 | 6*30*40 | Pouch |
| 603228V4 | 3.85 | 800 | 6*32*28 | Pouch |
| 613228V4 | 3.85 | 850 | 6.1*32*28 | Pouch |
| 623030V4 | 3.85 | 750 | 6.2*30*30 | Pouch |
| 632730V4 | 3.85 | 800 | 6.3*27*30 | Pouch |
| 632833V4 | 3.85 | 800 | 6.3*28*33 | Pouch |
| 642425V4 | 3.85 | 500 | 6.4*24*25 | Pouch |
| 642931V4 | 3.85 | 900 | 6.4*29*31 | Pouch |
| 653228V4 | 3.85 | 850 | 6.5*32*28 | Pouch |
| 682528V4 | 3.85 | 650 | 6.8*25*28 | Pouch |
| 702229V4 | 3.85 | 630 | 7*22*29 | Pouch |
| 702343V4 | 3.85 | 900 | 7*23*43 | Pouch |
| 752435V4 | 3.85 | 900 | 7.5*24*35 | Pouch |
| 753228V4 | 3.85 | 1000 | 7.5*32*28 | Pouch |
| 802035V4 | 3.85 | 850 | 8*20*35 | Pouch |
| 853033V4 | 3.85 | 1150 | 8.5*30*33 | Pouch |
| 102530V4 | 3.85 | 1000 | 10*25*30 | Pouch |
| 103862V4 | 3.85 | 4000 | 10*38*62 | Pouch |
| 123039V4 | 3.85 | 2050 | 12*30*39 | Pouch |
| 123137V4 | 3.85 | 1900 | 12*31*37 | Pouch |
*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.
Why Choose LithoTop for 502031 High Voltage Polymer Battery Solutions?
High voltage polymer batteries require more than a higher nominal voltage. To achieve reliable performance, the battery must control material stability, voltage consistency, internal resistance, thickness tolerance, cycle performance, charging compatibility, and protection circuit design.
LithoTop supports customers from sample development to mass production with professional engineering support and strict quality inspection. Our team can help evaluate battery size, runtime target, charging voltage, working current, connector type, PCM design, NTC requirement, and real application conditions before confirming the final battery solution.
01 – Smart Wearable Controller Project from Germany
A German wearable electronics company was developing a compact smart controller used with fitness and health monitoring products. The device needed to support Bluetooth connection, touch control, vibration reminder, and daily standby operation. The main challenge was that the customer wanted longer runtime without increasing the product thickness.
The customer contacted LithoTop because they needed a high energy density battery solution instead of simply using a larger cell. LithoTop reviewed the product structure, standby current, Bluetooth transmission peak, vibration motor load, charging circuit, and battery compartment tolerance.
After evaluation, LithoTop recommended the 502031 3.85V 400mAh High Voltage Polymer Battery. Our engineering team judged that the 3.85V high-voltage platform could provide more usable energy in a compact battery size, while the 400mAh capacity offered a better balance between runtime and product weight.
During sample development, LithoTop optimized the connector type, wire length, PCM protection option, cable outlet direction, and battery label to match the customer’s assembly process. Sample testing included capacity verification, Bluetooth transmission simulation, vibration motor load testing, charging compatibility testing, temperature monitoring, and installation fit checking.
Before mass production, both teams confirmed samples, battery dimensions, connector specifications, charging requirements, labeling details, and batch inspection standards. The final battery solution helped the wearable controller achieve longer daily use and more stable wireless performance. For the customer, this reduced redesign pressure and supported a smoother product launch.
02 – Smart Security Tracker Project from Canada
A Canadian IoT company was developing a small smart security tracker used for bags, tools, and portable assets. The product required stable power for Bluetooth communication, alarm reminder, motion detection, and periodic status updates. Their previous standard battery met the size requirement, but runtime dropped quickly during real user simulation.
The customer approached LithoTop because they needed a battery manufacturer that could evaluate real working conditions and provide a stable custom battery solution for future mass production. LithoTop analyzed the tracker’s standby current, alarm current, Bluetooth connection interval, charging method, enclosure layout, and expected daily usage pattern.
Based on this analysis, LithoTop recommended the 502031 3.85V 400mAh high voltage polymer battery. The 400mAh capacity supported compact product design, while the 3.85V high-voltage platform helped improve usable energy and maintain more stable performance during repeated wireless activity.
During prototype development, LithoTop adjusted the PCM protection design, connector position, wire length, insulation structure, and packaging method. Sample batteries were tested through standby simulation, wireless transmission pulse testing, alarm load testing, voltage stability checking, charge-discharge cycling, and installation fit verification.
Before mass production, the customer confirmed the approved sample, electrical performance, connector durability, packaging details, and incoming inspection standard. LithoTop then controlled production according to the confirmed golden sample.
The final battery solution helped the smart tracker achieve longer standby time and fewer unexpected low-power shutdowns. For the customer, this improved product reliability, reduced after-sales complaints, and made the device more competitive in the compact IoT tracking market.
More Customer Cooperation Cases
Powering leading batteries across wearables, medical devices, IoT, and consumer electronics in 30+ countries..
VR & AR Headset
A European VR headset manufacturer needed a lightweight battery with high energy density and customized dimensions. LithoTop developed a compact LiPo solution that extended operating time while fitting the device's limited internal space.
Portable Medical Monitor
A healthcare equipment company required a safe and reliable battery for a portable medical monitor. LithoTop engineered a custom LiPo battery with stable performance, long cycle life, and compact dimensions for mobile healthcare applications.
Portable Translator
A portable translator manufacturer needed a compact battery and long operating time. LithoTop engineered a customized LiPo battery that provided stable power, lightweight design, and reliable performance for AI-powered language translation devices.
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.
Yes. High voltage LiPo batteries usually require a compatible high-voltage charging circuit, such as a 4.35V/4.4V charging platform. The charging design should be confirmed before sample testing and mass production.
Related Products
Explore more customized lithium battery solutions from LithoTop
-
422424 260mAh High Voltage Polymer Battery
Add to cart -
602133 550mAh High Voltage Battery
Add to cart -
552531 500mAh High Voltage Lithium Battery
Add to cart -
601015 75mAh High Voltage LiPo Battery
Add to cart -
702229 630mAh High Voltage Lipo Battery
Add to cart -
502031 400mAh High Voltage Polymer Battery
Add to cart -
702025 420mAh High Voltage LiPo Battery
Add to cart -
402626 320mAh High Voltage LiPo Battery
Add to cart
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.
Global Certifications & Compliance Support
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.
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.
What Is the Difference Between LiPo and Li-ion Battery Packs?
Confusion costs time, money, and reliability. I see teams argue labels. They miss the real…
The Biggest Mistake When Choosing a UAV Battery Supplier?
You ask for a price quote. The supplier sends a number. You compare three quotes…
Talk to Engineer
Get Your Factory-Direct Quote
