High-Performance TWS Earbuds Battery Solutions | Custom Button Cells

In the competitive TWS (True Wireless Stereo) market, battery life and charging speed are the ultimate differentiators. Batteryswift provides industry-leading rechargeable Lithium-Ion button cells that empower audio brands to deliver longer playback times and sleeker ergonomic designs.

With over 42 self-developed innovation patents, our TWS batteries are engineered for high-drain applications, supporting advanced features like Active Noise Cancellation (ANC) and high-fidelity spatial audio.

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Key Technical Advantages

• Industry-Leading Energy Density: High specific energy density up to 470Wh/L, maximizing runtime in compact earbud housings.
• 5C Ultra-Fast Charging: Significantly reduces downtime, allowing users to get hours of playback from just a few minutes of charging.
• Extreme Discharge Capability: Supports up to 20C high-current discharge for stable peak performance.
• Extended Cycle Life: Maintains 80% capacity even after 800+ cycles, ensuring product longevity.
• Wide Temperature Resilience: Reliable operation in extreme conditions ($-50^{\circ}\text{C}$ to $+50^{\circ}\text{C}$ or $-20^{\circ}\text{C}$ to $+80^{\circ}\text{C}$).
• Certified Safety: Fully compliant with global standards including UN38.3 and IEC62133.

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Custom Button Cell Solutions (Bespoke Engineering)

We offer a 100% match for your product’s structural design. Unlike off-the-shelf components, our tailor-made button cells can be adjusted to your precise mechanical requirements.

Feature	Customization Range / Specifications
Material	High-performance Lithium Polymer (LiPo)
Voltage Platforms	$3.7\text{V}$, $3.8\text{V}$, $3.85\text{V}$
Capacity Range	$45\text{ mAh}$ to $65\text{ mAh}$ (Standard) / Up to $210\text{ mAh}$ (Extended)
Diameter	$9\text{ mm}$ to $16\text{ mm}$ (Customizable $\ge 7.8\text{ mm}$)
Height	$2.4\text{ mm}$ to $6.0\text{ mm}$
Internal Resistance	Approx. $200\text{ m}\Omega$
Charge/Discharge	3C Max Charge ($135\text{–}195\text{ mA}$) / 2C Max Continuous Discharge

Why Choose Batteryswift for TWS Development?

Our Shaped Button Cell technology allows audio engineers to break free from standard cylindrical constraints. By offering custom diameters and heights, we help you optimize the internal “dead space” of the earbud, allowing for larger drivers or additional sensors without increasing the device’s overall size.

Partner with Batteryswift to unlock the full potential of your next-generation TWS and wearable audio products.