ASOL 751645 Lithium Polymer Battery — A fast-charge 420mAh (1.554Wh) soft-pack Li-Po battery engineered for devices where rapid charging and ultra-compact form are product-defining requirements. The 2C charge rate (820mA) reduces full charge time to under 60 minutes — half the time of standard 1C batteries. The ultra-narrow 16mm width is ASOL’s narrowest standard battery format, enabling integration into smart watches, mini GPS trackers, smart bracelets, Bluetooth earbuds cases, medical wearable devices, and Bluetooth item finders.
2C Fast-Charge — Half the Wait Time
| Metric | ASOL 751645 (2C) | Standard 1C Battery |
|---|---|---|
| 80% Charge Time | ~30 minutes | ~90 minutes |
| Full Charge Time | ~60 minutes | ~2–3 hours |
| Max Charge Current | 820mA | ~420mA |
| Max Discharge Current | 840mA | ~420mA |
For TWS earbuds and e-cigarettes that users charge daily, the 2C fast-charge is a meaningful product improvement — less downtime, fewer complaints about slow charging.
Why 16mm Ultra-Narrow?
| Device Category | Standard Battery Width | 751645 Advantage |
|---|---|---|
| TWS Stems (AirPods-style) | 14~18mm internal | ⭐⭐⭐⭐⭐ 16mm fits perfectly |
| Smart Rings | 15~20mm internal | ⭐⭐⭐⭐⭐ 16mm ideal |
| ITC Hearing Aids | 15~22mm internal | ⭐⭐⭐⭐⭐ Fits |
| Pod-Mods | 18~22mm internal | ⭐⭐⭐⭐ Good fit |
The 16mm width is ASOL’s narrowest standard battery — purpose-built for ITC hearing aids and pod vapes where internal cavity width is the primary constraint.
Key Features
- ⚡ 2C Fast Charge (820mA) — ~30 min to 80%, ~60 min full charge
- ⚡ 2C Fast Discharge (840mA) — Supports burst power needs
- 📐 Ultra-Slim 7.5mm Profile — Fits compact device enclosures
- 📏 Ultra-Narrow 16mm Width — ASOL’s narrowest standard battery
- 🔋 420mAh / 1.554Wh — Adequate capacity for compact daily-use devices
- 🔄 ≥500 Cycle Life — Long-term reliability
- 🔌 2-Pin JST Connector — Customizable
- 🔒 Built-in PCM Protection
Specifications
| Parameter | Value |
|---|---|
| Model | 751645 |
| Chemistry | Lithium Polymer (Li-Po) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 420mAh |
| Nominal Energy | 1.554Wh |
| Dimensions (T×W×H) | 7.5×16×45mm |
| Impedance | ≤200mΩ |
| Charge Voltage | 4.2V |
| Max Charge Current | 820mA (2C) |
| Max Discharge Current | 840mA (2C, 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 |
| Cycle Life | ≥500 cycles (80% capacity retention) |
| Certifications | UN38.3, UL1642, CB, PSE |
| Protection | Built-in PCM |
| Connector | 2-Pin JST (Customizable) |
Applications
⌚ Smart Watch
- Smart Watch — The 751645’s 16mm ultra-narrow width and 7.5mm slim profile fit perfectly inside modern smart watch enclosures. 420mAh capacity delivers 1–2 days of typical usage including heart rate monitoring, notifications, GPS tracking, and app interactions. The 2C fast-charge means a quick 30-minute top-up restores 80% battery — ideal for daily wearables.
📍 Mini GPS Tracker
- Mini GPS Tracker / Pet Tracker — Compact 7.5×16×45mm form factor fits discreet tracker designs for keychains, pet collars, and asset tags. 420mAh provides 2–4 days of GPS standby depending on reporting frequency. The 2C fast-charge capability enables rapid field deployment without extended downtime.
📿 Smart Bracelet
- Smart Bracelet / Fitness Band — The ultra-narrow 16mm width is ideal for slim fitness band form factors. 420mAh supports 3–5 days of step tracking, sleep monitoring, and notification alerts. Featherweight design ensures all-day wrist comfort without bulk.
🎧 Bluetooth Earbuds Case
- Bluetooth Earbuds / TWS Charging Case — 16mm ultra-narrow width fits compact charging case housings; 420mAh provides 3–4 full recharges for standard earbuds. The 2C fast-charge cuts case recharge time to under 60 minutes. OEM-friendly with custom tab and connector options.
🏥 Medical Wearable Device
- Medical Wearable Device / Health Monitor — The 751645’s compact form and reliable 420mAh capacity suit portable medical wearables such as pulse oximeters, wearable ECG monitors, and continuous glucose monitoring receivers. 2C fast-charge ensures minimal downtime for critical health monitoring devices. UN38.3 certified for safe global logistics.
🔍 Bluetooth Item Finder
- Bluetooth Item Finder / Key Finder — Ultra-compact form factor ideal for key-finder and item-tracker enclosures. 420mAh supports 8–12 months of Bluetooth beacon standby with periodic location broadcasts. The 16mm narrow width allows slim tag designs that fit on keychains, wallets, and luggage.
Why Choose ASOL 751645?
2C Fast-Charge = Better User Experience — At 820mA max charge current (2C), the 751645 charges in roughly half the time of a standard 1C cell. For smart watches and medical wearable devices that users rely on daily, this is a meaningful product improvement — less downtime, more continuous monitoring.
16mm Ultra-Narrow = Fits Where Others Can’t — The 16mm width is ASOL’s narrowest standard battery format. This enables integration into slim smart watch casings, fitness bands, mini GPS trackers, and Bluetooth earbuds cases — products where internal cavity width is the primary constraint.
Global certification coverage — With UN38.3, UL1642, CB, and PSE certifications, the 751645 is pre-cleared for deployment across major global markets.
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 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 |
