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
- 🔋 250mAh / 0.925Wh Compact Power — High energy density in ASOL’s smallest form factor
- 📐 Ultra-Ultra-Thin 3.1mm Profile — Fits the thinnest in-ear and wearable enclosures
- 📏 Compact 30.5×32.5mm Footprint — Among the smallest standard ASOL cells
- ⚡ 250mA Max 1C Discharge — Continuous power delivery for micro devices
- 🔄 ≥500 Cycle Life — Reliable long-term performance with minimal degradation
- 🌡️ Wide Temperature Range — Discharge -20
60°C, charge 045°C - 🛡️ UN38.3 Certified — Safe for global air transport
- 🔧 OEM/ODM Ready — 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
🎧 TWS Earbuds Charging Case
- TWS Earbuds Charging Case — 3.1mm ultra-thin fits the smallest charging case housings; 250mAh provides 2–3 full recharges for standard earbuds. The compact 30.5×32.5mm footprint maximizes case internal space for PCB and connectors. OEM-friendly with custom tab and connector options.
🔍 Bluetooth Item Finder
- Bluetooth Item Finder / Key Finder — Ultra-compact form factor ideal for key-finder and item-tracker enclosures. 250mAh supports 6–12 months of Bluetooth beacon standby with periodic location broadcasts. The 3.1mm thin profile allows slim tag designs that fit on keychains, wallets, and luggage.
⌚ Smart Watch
- Smart Watch / Smart Bracelet — Compact 30.5×32.5mm footprint fits slim smart watch and fitness band designs. 250mAh supports 1–2 days of typical smart watch use (heart rate, notifications, step tracking). The 3.1mm ultra-thin profile enables sleek, lightweight wearable industrial design.
📍 Mini GPS Tracker
- Mini GPS Tracker — Small form factor perfect for personal and pet GPS trackers where size is critical. 250mAh provides 1–3 days of GPS standby depending on reporting frequency. The ultra-thin 3.1mm profile allows discreet tracker designs for keychains, collars, and small asset tags.
⭕ Smart Ring
- Smart Ring — The 303030’s 3.1mm ultra-ultra-thin profile is essential for ring-shaped enclosures where every fraction of a millimeter matters. At 30.5×32.5mm it fits seamlessly inside smart ring bands. 250mAh provides 1–2 days of fitness tracking, sleep monitoring, and notification alerts. The featherweight ~5.5g design ensures all-day comfort on the finger.
Why Choose ASOL 303030?
Ultra-miniature professional power — The ASOL 303030 delivers 250mAh (0.925Wh) in an ultra-ultra-thin 3.1mm profile with a 30.5×32.5mm footprint — ASOL’s smallest standard cell designed for the most miniaturized wearable and ultra-compact devices. Whether powering a TWS earbuds charging case, a Bluetooth item finder, a smart watch, a mini GPS tracker, or a smart ring, this battery provides reliable micro power without compromising device design.
UN38.3 certified for global logistics — The 303030 is UN38.3 certified, ensuring safe air transport worldwide. ASOL’s OEM/ODM team supports custom tabs, wire harnesses, connectors, and PCM protection circuit integration.
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.
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 |
