ASOL 502540 Lithium Polymer Battery — A compact 500mAh soft-pack Li-Po battery designed for portable consumer electronics. With its rectangular 50.5×25.5mm footprint and 42.5mm 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
- 🔋 500mAh Capacity — 1.85Wh in a compact 50.5×25.5×42.5mm rectangular form
- ⚡ Max Charge 250mA / Max Discharge 500mA — 0.5C charge, 1C discharge for reliable daily power
- 📦 Soft Pack Design — Aluminum-laminated polymer construction, lightweight and flexible
- 📐 Rectangular Footprint — 50.5×25.5mm fits a wide range of slim consumer device cavities
- 🔄 ≥500 Cycles — Long service life with minimal capacity fade under normal use
- ⚡ Stable Voltage Output — Consistent performance throughout the entire discharge cycle
- 🌡️ Wide Operating Range — Charge: 0~45°C / Discharge: -20~60°C
- 🪶 Lightweight — Approx. 14g — ideal for wearable and portable devices
- ⚙️ OEM/ODM Support — Available with tabs, wires, connectors, or fully custom form
- 🛡️ UN38.3 Certified — 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 |
| Length (L) | 50.5mm (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
🎧 Audio & Sound
TWS earbuds charging cases (left/right + case), mini Bluetooth speakers, portable wireless headphones, voice recorders, portable FM radios, true wireless earphone replacement battery
⌚ Wearables & Smart Devices
Smart watches, fitness trackers, GPS tracking devices, child location trackers, pet trackers, sports smart rings, calorie-tracking wristbands, wearable health monitors
🚗 Automotive Electronics
Dash cameras (car DVR), GPS navigation units, car Bluetooth adapters, tire pressure monitoring systems, vehicle backup camera batteries, OBD-II scanner batteries
🏠 Smart Home & Security
Smart locks, wireless doorbells, mini security cameras, IoT sensor nodes, door/window sensors, smart plug adapters, voice assistant remotes, home automation hubs
📡 IoT & Portable Tools
BLE beacons, environmental monitoring sensors, handheld label makers, digital measuring tools, portable diagnostic devices, wireless barcode scanners, portable POS accessories
Why Choose ASOL Li-Po Batteries?
ASOL Battery combines cutting-edge lithium polymer cell engineering with rigorous quality assurance across every production batch. The 502540 is optimized for the most popular category of consumer electronics — devices that require reliable daily power in a compact, lightweight form. Its rectangular 50.5×25.5mm footprint is one of the most widely compatible form factors in the industry.
All ASOL Li-Po batteries are UN38.3 certified for safe global air transport. Our dedicated OEM/ODM team supports custom tabs, wiring harnesses, connector integration, and PCM (protection circuit module) assembly — so you receive a battery ready to drop into production with minimal engineering overhead.
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.
Contact Us
| Channel | Information |
|---|---|
| info@asol-battery.com | |
| +86 157 7985 8703 | |
| 🌐 Website | www.asol-battery.com |
| ⏰ Response Time | Within 24 hours on working days |
