ASOL 751645 Lithium Polymer Battery — A fast-charge 420mAh (1.554Wh) soft-pack Lithium Polymer 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 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 (Lithium Polymer) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 420mAh |
| Nominal Energy | 1.554Wh |
| Dimensions (T×W×H) | 7.5×16×45mm |
| Impedance | ≤100mΩ |
| 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 |
| Protection | Built-in PCM |
| Connector | 2-Pin JST (Customizable) |
Applications
Where the 751645 is used
Slim 16mm fit · 420mAh runs 1-3 days per charge.
Discreet pet & asset tags · 2-5 days GPS standby.
Narrow 16mm width · 3-7 days of activity tracking.
Pulse oximeters & ECG monitors · fast 2C recharge.
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 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 and bespoke-spec orders are welcome; complete certification documentation is included.
Frequently Asked Questions
What are the key specifications of the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell?
The ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell is a 3.7V 420mAh lithium battery, measuring 7.5×16×45mm.
What connector does the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell use?
It ships pre-wired with a 2-Pin JST connector. ASOL can customize the connector type, wire length, and labeling to match your device.
What is the maximum discharge current of the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell?
The ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell supports a maximum continuous discharge current of 820mA.
How many charge cycles does the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell last?
The ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell is rated for ≥500 cycles, retaining strong capacity across its service life.
What safety certifications does the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell 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 751645 3.7V 420mAh Lithium Polymer Battery Cell?
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 sample or a quote for the ASOL 751645 3.7V 420mAh Lithium Polymer Battery Cell?
Yes. Sample evaluation may be available for selected cylindrical and lithium polymer battery projects, subject to specification review and product availability. Sample freight is paid by the customer. Email info@asolbattery.com or message +86 15779858703 on WhatsApp for a quote — ASOL typically responds within 24 hours on working 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 →
