Introduction
25mAh 3.7V Bluetooth Headphone Polymer Lithium Battery utilizes Grade-A micro-cells to achieve sub-gram weights. It resolves the issue of wearer fatigue in TWS devices while maintaining reliable, high-cycle energy density.
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Item |
Specifications |
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Charge voltage |
4.2V |
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Nominal voltage |
3.7V |
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Nominal capacity |
25mAh 0.5C Discharge |
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Charge current |
Standard Charging: 0.5C Rapid charge: 1.0C |
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Discharge current |
Standard discharging: 0.5C Rapid discharging: 1.0C to ≤ 0.01C |
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Standard Charging method |
0.5C CC(constant current)charge to4.2V,then CV(constant voltage 4.2V)charge till charge current decline to ≤0.02C |
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Charging Time |
Standard Charging: 3.5 hours |
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Standard discharge method |
0.5C CC(constant current)discharge to Min Discharge cut-off voltage(3.3) |
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Operating temperature |
Charging ：0℃~45℃ Discharging: -20℃~60℃ |
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Storage temperature |
-20℃~ +45℃ |
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Storage humidity |
45~65%RH |
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Vibration Test |
After standard charge, fixed the cell to ibration table and subjected to vibration cycling that the frequency is to be varied at the rate of 1Hz per minute between 10Hz and 55Hz, the excursion of the vibration is 1.6mm.The cell shall be vibrated for 30 minutes per axis of XYZ axes. |
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Drop Test |
The cell is to be dropped from a height of meter twice onto concrete ground .no fire, no leakcage |
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Cycle time |
≥300times ≥300 |
Key Features
Tight Capacity Matching
Cells are graded by capacity and internal resistance to ensure balanced performance between left and right earbud units.
Stable Low-Load Discharge
Optimized for low-current audio devices to maintain stable voltage output during continuous playback.
Reinforced Pouch Structure
Improved sealing process reduces swelling risk during repeated charge cycles and long-term use.
Integrated Protection Support
Compatible with PCM protection circuits to prevent overcharge, over-discharge, and short circuit.
Customization Options
Shape Customization: Ultra-narrow strips (down to 1mm width), curved cells for rings, or square footprints.
Tab Engineering: Same-side/opposite-side leads or custom tab angles for high-density soldering.
Lead Wire Selection: Ultra-fine 32AWG leads or enamel-insulated wires to maximize internal housing space.
Micro-PCM Integration: Specialized protection boards with ultra-low static power consumption to extend shelf life.
Application
Audio & Communications: TWS earbuds, stealth Bluetooth headsets, and digital hearing aids.
Smart Wearables: Smart rings, smart glasses (temple integration), and sleep trackers.
Medical Healthcare: Capsule endoscopes, portable biosensors, and smart patches.
Precision Tools: Active stylus pens, micro remote controls, and smart jewelry.
Quality Control Process
To ensure high assembly yields for our clients, every batch follows a zero-defect inspection flow:
Raw Material Verification: High-purity cobalt cathode inspection.
100% Capacity Grading: Precise mAh measurement for batch uniformity.
Internal Resistance Sorting: Minimizing heat generation and improving efficiency.
OCV/Voltage Screening: 15-30 days of storage to detect and remove cells with high self-discharge.
Safety Abuse Testing: Vibration and 1.0m drop tests to ensure structural integrity.
FAQ
Q: Can this battery be customized for different earbud designs?
A: Yes, customization is available for dimensions, tabs, connectors, and protection circuit configurations.
Q: Do you support OEM/ODM production?
A: Yes, we support OEM/ODM manufacturing including capacity tuning, structural adjustment, and labeling.
Q: Do you provide samples for evaluation?
A: Yes, samples are available for engineering testing, typically within 3–10 days.
Q: What certifications does this battery support?
A: The product can be supplied with UN38.3, MSDS, and IEC62133 documentation for international shipping.
Q: What shipping methods are available?
A: We support air freight, sea freight, and express delivery with lithium battery-compliant packaging.
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