ASOL 502540 Lithium Polymer Battery — A compact 500mAh soft-pack Li-Po battery designed for portable consumer electronics. With its rectangular 25.5×42.5mm footprint and 5.0mm profile, this battery delivers reliable 1.85Wh energy in a space-efficient form factor. Ideal for TWS earbud charging cases, mini Bluetooth speakers, smart wearables, and IoT devices requiring balanced capacity and compact size.
🔋 Why Lithium Polymer vs Cylindrical Cells?
Unlike traditional cylindrical batteries (e.g. 18650), lithium polymer soft-pack cells offer decisive advantages for modern compact consumer devices:
- 📏 Thinner Profile — As low as 3mm thickness vs minimum 18mm for 18650
- 🔄 Flexible Shape — Adapts to custom enclosures, curved designs, and irregular cavities
- 🪶 Lighter Weight — Up to 30% lighter than equivalent-capacity cylindrical cells
- 🔒 No Pressure Vents — Safer for compact sealed devices with limited venting
- ⚡ Higher Energy Density — Maximizes capacity in minimal physical space
- 🔧 OEM-Friendly Customization — Tabs, wires, connectors, and form factor tailored to your product
Key Features
Compact power, built to last
1.85Wh in a compact 5.0×25.5×42.5mm rectangular form.
0.5C charge, 1C discharge for reliable daily power.
Aluminum-laminated polymer construction, lightweight and flexible.
25.5×42.5mm fits many slim consumer device cavities.
Long service life with minimal capacity fade under normal use.
Consistent performance throughout the entire discharge cycle.
Charge: 0~45°C / Discharge: -20~60°C.
Approx. 14g – ideal for wearable and portable devices.
Available with tabs, wires, connectors, or fully custom form.
Safe for air transport; full documentation available.
Specifications
| Parameter | Value |
|---|---|
| Model | 502540 |
| Cell Type | Lithium Polymer (Li-Po) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 500mAh |
| Energy | 1.85Wh |
| Thickness (T) | 5.0mm (Max) |
| Width (W) | 25.5mm (Max) |
| Height (H) | 42.5mm (Max) |
| Configuration | 1S1P |
| Impedance | 200mΩ |
| Charge Voltage | 4.2V |
| Standard Charge Current | 100mA (0.2C) |
| Max Charge Current | 250mA (0.5C) |
| Standard Discharge Current | 100mA (0.2C) |
| Max Discharge Current | 500mA (1C, continuous) |
| Discharge Cut-off | 3.0V |
| Charge Temp | 0~45°C |
| Discharge Temp | -20~60°C |
| Storage Temperature | -10~35°C |
| Cycle Life | ≥500 cycles (100% DOD, 0.2C, 25°C) |
| Weight | Approx. 14g |
| Certification | UN38.3 |
Applications
Where the 502540 is used
TWS earbud cases, mini Bluetooth speakers, voice recorders
Smart watches, fitness trackers, GPS & pet trackers
Dash cams, GPS units, TPMS, OBD-II scanners, backup cameras
Smart locks, wireless doorbells, mini security cameras
BLE beacons, sensors, barcode scanners, POS accessories
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.
Custom prototype samples in 5–7 business days before volume production.
Every unit tested for OCV, capacity & protection. Defect rate <0.3%.
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 |
| 1,000–4,999 pcs | Contact us | 15% off |
| 5,000+ pcs | Contact us | 20%+ off |
📌 Sample orders and custom specifications welcome. Full UN38.3 certification documentation provided.
❓ Frequently Asked Questions
What are the key specifications of the ASOL 502540 3.7V 500mAh Lithium Polymer Battery?
The ASOL 502540 3.7V 500mAh Lithium Polymer Battery is a 3.7V 500mAh lithium battery, built in a 1S1P configuration, weighing ~14g.
What is the maximum discharge current of the ASOL 502540 3.7V 500mAh Lithium Polymer Battery?
The ASOL 502540 3.7V 500mAh Lithium Polymer Battery supports a maximum continuous discharge current of 250mA.
How many charge cycles does the ASOL 502540 3.7V 500mAh Lithium Polymer Battery last?
The ASOL 502540 3.7V 500mAh Lithium Polymer Battery is rated for ≥500 cycles, for years of dependable performance in your device.
What safety certifications does the ASOL 502540 3.7V 500mAh Lithium Polymer Battery have?
It is certified to UN38.3, with test reports supplied on request for compliance.
Does ASOL offer OEM/ODM customization for the ASOL 502540 3.7V 500mAh Lithium Polymer Battery?
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 free sample or a quote for the ASOL 502540 3.7V 500mAh Lithium Polymer Battery?
We offer free samples (you cover shipping). For a quote, email info@asolbattery.com or WhatsApp +86 15779858703 — replies typically arrive within 4 hours on business days.
Contact Us
| Channel | Information |
|---|---|
| info@asolbattery.com | |
| +86 157 7985 8703 | |
| 🌐 Website | www.asolbattery.com |
| ⏰ Response Time | Within 24 hours on working days |
Need a different size or capacity? Explore ASOL’s full lithium polymer battery range →
