ASOL 303030 Lithium Polymer Battery — A 250mAh ultra-compact soft-pack Li-Po delivering 0.925Wh energy in an ultra-ultra-thin 3.1mm profile. At only 30.5×32.5mm in footprint, this is ASOL’s smallest standard battery — engineered for next-generation miniaturized wearables and ultra-compact electronics: TWS earbuds charging cases, Bluetooth item finders, smart watches, mini GPS trackers, and smart rings.
Why Lithium Polymer vs Coin Cell?
- 📐 Ultra-Ultra-Thin 3.1mm — Thinner than standard thin batteries; fits the most space-constrained in-ear and wearable enclosures
- 📏 Compact 30.5×32.5mm Footprint — Among ASOL’s smallest standard cells by footprint area
- 🔋 250mAh in Micro Package — 4× the capacity of a typical CR1220 coin cell (≈35mAh)
- ⚡ 1C Balanced Power — 250mA continuous delivery suits ultra-compact device load profiles
- 🪶 Featherweight Soft Pack — Aluminum-laminated construction minimizes device weight
- 🔧 Flexible Integration — Adapts to irregular and curved enclosures common in wearables
- 🏭 OEM-Friendly — Custom tabs, wires, connectors, and PCM available
Key Features
Tiny cell, dependable power
High energy density in ASOL’s smallest form factor.
Fits the thinnest in-ear and wearable enclosures.
Among the smallest standard ASOL cells.
Continuous power delivery for micro devices.
Reliable long-term performance with minimal degradation.
Discharge −20–60°C, charge 0–45°C.
Safe for global air transport.
Custom tabs, wires, connectors, protection circuits.
Specifications
| Parameter | Value |
|---|---|
| Model | 303030 |
| Chemistry | Lithium Polymer (Li-Po) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 250mAh |
| Nominal Energy | 0.925Wh |
| Dimensions (T×W×H) | 3.1×30.5×32.5mm |
| Charge Voltage | 4.2V |
| Standard Charge Current | 50mA (0.2C) |
| Max Charge Current | 250mA (1C) |
| Standard Discharge Current | 50mA (0.2C) |
| Max Discharge Current | 250mA (1C, continuous) |
| Charge Cut-off | 4.2V |
| Discharge Cut-off | 2.5V |
| Charge Temperature | 0~45°C |
| Discharge Temperature | -20~60°C |
| Storage Temperature | -20~45°C (recommended) |
| Cycle Life | ≥500 cycles (100% DOD, 0.2C, 25°C) |
| Weight (Approx.) | ~5.5g |
| Certifications | UN38.3 |
Applications
Where the 303030 is used
3.1mm thin fits charging cases · 2–3 full earbud recharges.
Slim key & item tags · 6–12 months beacon standby.
Slim wearable fit · 1–2 days heart-rate & notifications.
Discreet pet & asset trackers · 1–3 days GPS standby.
Ultra-thin ring fit · 1–2 days fitness & sleep tracking.
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 |
📌 Wholesale Note: Sample orders and custom specifications welcome. Full certification documentation provided with shipment.
❓ Frequently Asked Questions
What are the key specifications of the ASOL 303030 3.7V 250mAh Lithium Polymer Battery?
The ASOL 303030 3.7V 250mAh Lithium Polymer Battery is a 3.7V 250mAh lithium battery, measuring 3.1×30.5×32.5mm, weighing ~5.5g.
What is the maximum discharge current of the ASOL 303030 3.7V 250mAh Lithium Polymer Battery?
The ASOL 303030 3.7V 250mAh Lithium Polymer Battery supports a maximum continuous discharge current of 250mA.
How many charge cycles does the ASOL 303030 3.7V 250mAh Lithium Polymer Battery last?
The ASOL 303030 3.7V 250mAh Lithium Polymer Battery is rated for ≥500 cycles, retaining strong capacity across its service life.
What safety certifications does the ASOL 303030 3.7V 250mAh Lithium Polymer Battery have?
It is certified to UN38.3, and full test reports can be provided on request.
Does ASOL offer OEM/ODM customization for the ASOL 303030 3.7V 250mAh Lithium Polymer Battery?
Yes. As a lithium battery manufacturer, ASOL provides full OEM/ODM customization — capacity, voltage, cell configuration, connector type, wire length, and label printing can all be tailored to your application and order volume.
Can I get a free sample or a quote for the ASOL 303030 3.7V 250mAh Lithium Polymer Battery?
Yes. Free samples are available — you only cover the shipping cost. Email info@asolbattery.com or message +86 15779858703 on WhatsApp for a quote — ASOL typically responds 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 →
