Why Polymer vs Cylindrical?
Unlike traditional cylindrical batteries, lithium polymer batteries offer:
- Thinner Profile — As low as 3mm thickness vs minimum 18mm for 18650
- Flexible Shape — Adapts to custom enclosures and curved designs
- Lighter Weight — Up to 30% lighter than equivalent capacity cylindrical cells
- No Pressure Vents — Safer for ultra-compact devices with limited venting
- Higher Energy Density — Maximizes capacity in minimal space
Key Features
- 🔋 Mini Size — 4.1×30.5×43mm fits ultra-compact designs
- ⚡ 400mAh Capacity — 1.48Wh energy in tiny package
- 📦 Soft Pack Design — Aluminum-laminated polymer construction
- 📐 Ultra-Slim Profile — 4.1mm thickness for sleek devices
- 🔄 500+ Cycles — Extended service life with minimal fade
- 🔒 Multi-Certified — UL, CB, KC, PSE, CQC, UN38.3
- 🌡️ Wide Range — Charge: 0
45°C / Discharge: -2060°C - 🔧 Custom Integration — Available with tabs, wires, or custom connectors
Specifications
| Parameter | Value |
|---|---|
| Model | 403040 |
| Cell Type | Lithium Polymer (Li-Po) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 400mAh |
| Energy | 1.48Wh |
| Dimensions | 4.1×30.5×43mm |
| Configuration | 1S1P |
| Impedance | ≤150mΩ |
| Charge Voltage | 4.2V |
| Discharge Cut-off | 2.5V |
| Max Charge/Discharge | 400mA (1C) |
| Charge Temp | 0~45°C |
| Discharge Temp | -20~60°C |
| Cycle Life | 500+ cycles |
| Certifications | UL, CB, KC, PSE, CQC, UN38.3 |
Applications
- TWS Earbuds & Charging Cases
- Smart Watches & Fitness Trackers
- Bluetooth Headsets
- IoT Sensors & Beacons
- Smart Home Devices
- Portable Medical Monitors
- Stylus Pens
- Mini GPS Trackers
- Electronic Tags
- Wearable Cameras
Why Choose ASOL Li-Po Batteries?
ASOL’s polymer lithium batteries combine cutting-edge cell technology with rigorous quality assurance. The soft-pack design offers superior energy density, lighter weight, and greater design flexibility compared to cylindrical cells. Our ultra-compact Li-Po batteries are engineered specifically for miniature devices where every millimeter counts. With comprehensive certifications, ASOL Li-Po batteries are ready for global market deployment.
Contact Us
| info@asol-battery.com | |
| +86 15779858703 | |
| 🌐 Website | www.asol-battery.com |
| ⏰ Response Time | 24h on working days |
