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50 Series Lithium Polymer Battery for TWS Earbuds & Smart Wearable Devices

Balanced OEM Battery Platform for Compact Smart Electronics

The 50 Series Lithium Polymer Battery is designed for compact and ultra-thin electronic devices that require stable power output, lightweight structure, and flexible customization. With strong engineering capability in polymer lithium battery design, we provide OEM/ODM battery solutions widely used in Bluetooth devices, smart wearables, GPS trackers, and portable electronics.

400mah Polymer Lithium Ion Battery
400mAh Polymer Lithium Ion Battery features a high-density, ultra-slim design. It solves tight internal space issues for wearables while ensuring safety and stable power through precision factory-integrated protection circuits.
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Rechargeable Lithium Ion Polymer Battery Pack 3.7 V
The 3.7V Rechargeable Lithium-ion Polymer Battery Pack is a rechargeable battery based on lithium polymer technology, designed to provide continuous power for drones, medical equipment, smart wearables, and portable electronic devices.
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Lithium Ion Polymer Battery 3.7 V 250mah
The 3.7V 250mAh Lithium-Ion Polymer Battery is a lightweight and slim lithium battery, suitable for providing continuous power to smart wearables, Bluetooth devices, and miniature electronic products.
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Lithium Ion Polymer Battery 3.7 V 120mah
The 3.7V 120mAh Lithium-ion Polymer Battery is a lightweight, slim, and rechargeable battery suitable for smart wearables, sensors, and portable devices; it supports OEM customization and bulk supply.
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Lithium Ion Polymer Battery 3.7 V 200mah
The 3.7V 200mAh Lithium-ion Polymer Battery is a lightweight energy storage solution suitable for Bluetooth headsets, sensors, and portable devices; it is available for bulk ordering and supports structural customization.
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Lithium Ion Battery 65mah
The 65mAh Lithium-Ion Battery is a miniature rechargeable lithium-ion cell suitable for use in Bluetooth devices, sensors, and medical electronics.
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3.7v 280mah Polymer Lithium Ion Battery
3.7v 280mah Polymer Lithium Ion Battery integrates low-impedance cells and premium PCM to prevent swelling and over-discharge, ensuring long-term shelf life and reliable power for micro-devices.
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Lithium Ion Polymer Battery 3.7 V 40mah
Lithium Ion Polymer Battery 3.7 V 40mah is a compact rechargeable power cell designed for ultra-small devices, solving space constraints while ensuring stable voltage output and reliable cycle performance.
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50 Series Battery Selection Guide

Our 50 Series batteries are developed based on real device application requirements, ensuring compatibility with different product structures.

Model	Capacity	Thickness	Design Purpose	Typical Application
501040	~40mAh	~4–5mm	Ultra-small power module	TWS earbuds
501065	~65mAh	~5mm	Low-power wireless device	Bluetooth modules
501120	~120mAh	~5–6mm	Balanced runtime device	Smartwatches
501200	~200mAh	~6mm	Extended standby device	GPS trackers
501250	~250mAh	~6–8mm	High runtime wearable	IoT devices
Custom	40–300mAh	4–10mm	OEM structural design	Custom electronics

Application Scenarios

TWS Earbuds & Charging Cases

Battery optimized for ultra-compact acoustic modules with limited PCB space.

GPS Tracking Devices

Supports long standby operation for asset tracking and location monitoring devices.

Lithium Ion Polymer Battery 3.7 V 250mah

Smart Wearable Devices

Used in smartwatches, fitness bands, and health monitoring devices requiring continuous low-power operation.

IoT & Compact Electronics

Used in wireless sensors, smart home modules, and embedded communication devices.

OEM / ODM Battery Customization Support

We support full customization for electronic product development, including:

Battery size and thickness customization.

Capacity adjustment based on device power demand.

PCM / BMS protection system integration.

Connector and wiring configuration customization.

Prototype development for new product validation.

Fast charging compatibility optimization.

International Standards for Global OEM Supply

Our products are manufactured under strict quality and compliance systems:

Iso9001 Quality Management System

CCC Certification

UL Certification

KC Certification

RoHS Compliance

Invention & Utility Patents

Packaging & Shipping

productcate-780-523

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FAQ

Q: Can the 50 Series battery be customized for different device structures?

A: Yes. Dimensions, thickness, and capacity can be adjusted based on product design requirements.

Q: What devices are suitable for this battery series?

A: It is mainly used in TWS earbuds, smart wearables, GPS trackers, and compact IoT devices.

Q: What is the minimum thickness available?

A: Depending on structure design, ultra-thin configurations around 4mm can be supported.

Q: Do you support PCM or BMS integration?

A: Yes, protection circuit integration is supported for OEM applications.

Q: Can I request samples before bulk production?

A: Yes, sample production is available for evaluation and testing.

Q: What is the typical production lead time?

A: Generally 14–30 days depending on customization complexity and order volume.

As one of the most professional 50 series battery manufacturers and suppliers in China, we also support custom service. Please feel free to wholesale bulk cheap 50 series battery from our factory. For price consultation, contact us.

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