ASOL 302025 Lithium Polymer Battery — An ultra-thin rechargeable Lithium Polymer soft pack battery engineered for compact wearable and miniaturized electronic devices. Delivering 110mAh (0.407Wh) in an exceptionally slim 3.1mm profile (20.5mm × 28mm footprint), this battery sets the standard for space-constrained power solutions. It is the ideal power source for smart watches, fitness bands, TWS (True Wireless Stereo) earbuds, in-ear hearing aids, smart glasses, portable medical devices, and other next-generation wearable electronics. The aluminum-laminated soft pack construction ensures a lightweight, safe, and reliable power solution that fits seamlessly into the most space-sensitive product designs.
Why Polymer vs Cylindrical?
Unlike traditional cylindrical batteries, lithium polymer batteries offer:
- Ultra-Thin Profile — Only 3.1mm thickness for ultra-slim, form-fitting devices
- Flexible Shape — Adapts to curved enclosures, earbud shells, and irregular form factors
- Lightweight — Critical for wearables that must be comfortable for all-day wear
- No Pressure Vents — Safer for sealed miniaturized devices worn close to the body
- Higher Energy Density — Maximum power in minimum space for all-day battery life
- Customization — Tabs, wires, connectors, and protection circuits available
Key Features
Ultra-slim power for wearables
110mAh (0.407Wh) powers watches, bands, and all-day wearables.
Aluminum-laminated polymer construction, lightweight and flexible.
Engineered for ultra-thin wearable device enclosures.
≤15mΩ AC impedance for efficient power delivery.
Long service life with minimal capacity fade (100% DOD, 1C).
Charge 0–45°C / discharge -20–60°C for versatile use.
Tabs, wires, connectors, or protection circuits (PCM/PTC).
Safe for air transport worldwide.
Custom dimensions, capacity, connectors, and branding available.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | 302025 |
| Cell Type | Lithium Polymer (Lithium Polymer) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 110mAh |
| Energy | 0.407Wh |
| Dimensions | 3.1mm × 20.5mm × 28mm (T×W×H) |
| Thickness | 3.1mm |
| Configuration | 1S1P |
| AC Impedance | ≥5mΩ |
| Charge Voltage | 4.2V |
| Standard Charge Current | 55mA (0.5C) |
| Max Charge Current | 110mA (1C) |
| Discharge Cut-off | 2.5V |
| Max Discharge Current | 110mA (1C) |
| Charge Temperature | 0~45°C |
| Discharge Temperature | -20~60°C |
| Storage Temperature | -10~35°C (recommended for long-term storage) |
| Cycle Life | ≥500 cycles (100% DOD, 1C charge/discharge, 80% retention) |
| Certifications | UN38.3 |
Applications
Where the 302025 is used
Fitness bands, smart watches & rings in a slim cell.
True-wireless earbuds and bone-conduction headphones.
Hearing aids, CGM sensors & wearable health patches.
Smart & AR glasses, camera glasses, audio sunglasses.
BLE beacons, GPS pet tags and IoT sensor nodes.
Why ASOL
Factory-direct, fully customizable
Connector, wire gauge, heat-shrink color, custom brand label, BMS & housing.
Integrated PCB against overcharge, over-discharge, overcurrent & short circuit.
Grade-A cells, voltage-matched ±10mV for stable, reliable performance.
Sample evaluation may be available for selected cylindrical and lithium polymer battery projects, subject to specification review and product availability. Sample freight is paid by the customer.
Inspection requirements and acceptance criteria are confirmed for each project before order release.
UN38.3 Class 9 air & sea · DHL/FedEx/UPS · EXW/FOB/CIF/DDP.
Wholesale Pricing
| Quantity | Unit Price | Savings |
|---|---|---|
| 100-499 pcs | Contact us | - |
| 500-999 pcs | Contact us | 8% off |
| 1000+ pcs | Contact us | 15% off |
Custom specifications are welcome. Sample evaluation may be available for selected cylindrical and lithium polymer battery projects, subject to specification review and product availability. Sample freight is paid by the customer. Contact us for project-specific pricing and timing after specification review.
Frequently Asked Questions
What are the key specifications of the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell?
The ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell is a 3.7V 110mAh lithium battery, built in a 1S1P configuration, measuring 3.1mm × 20.5mm × 28mm.
What is the maximum discharge current of the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell?
The ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell supports a maximum continuous discharge current of 110mA.
How many charge cycles does the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell last?
The ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell is rated for ≥500 cycles, for years of dependable performance in your device.
What safety certifications does the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell have?
It is certified to UN38.3, with test reports supplied on request for compliance.
Does ASOL offer OEM/ODM customization for the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell?
Absolutely. As the manufacturer, ASOL tailors the cell — voltage, capacity, connector, wiring and private-label printing — to match your device and production volume through our OEM/ODM service.
Can I get a sample or a quote for the ASOL 302025 3.7V 110mAh Lithium Polymer Battery Cell?
Sample evaluation may be available for selected cylindrical and lithium polymer battery projects, subject to specification review and product availability. Sample freight is paid by the customer. For a quote, email info@asolbattery.com or WhatsApp +86 15779858703 — replies typically arrive within 24 hours on working days.
Contact Us
| Channel | Information |
|---|---|
| info@asolbattery.com | |
| +86 15779858703 | |
| Website | www.asolbattery.com |
| Response Time | 24 Hours on Working Days |
Need a different size or capacity? Explore ASOL’s full lithium polymer battery range →
