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621437 3.7V 280mAh LiPo Battery
$1.68
Model 621437 3.7V 280mAhlithium polymer battery. High energy density with built-in BMS protection. Ideal for portable electronics, wearables and IoT devices. Custom sizes available. HNF Battery manufacturer.
Product Overview
The 621437 3.7V 280mAh LiPo Battery is an ultra-compact rechargeable lithium polymer cell precision-engineered for miniaturized electronics where space, weight, and reliability are paramount. Measuring just 6.2Γ14Γ37mm and weighing approximately 5g, it is purpose-built for smartwatches, TWS earbuds, hearing aids, micro IoT sensors, compact medical wearables, and other size-critical devices that demand a dependable, long-life power source in the smallest possible footprint.
Every cell is manufactured under strict process controls with 100% electrical testing before shipment, ensuring consistent capacity, voltage, and dimensional accuracy for seamless OEM integration.
Key Features
- β Ultra-Compact Form Factor β 6.2Γ14Γ37mm, one of the smallest rechargeable LiPo cells available
- β Lightweight β ~5g, minimizes impact on device weight and balance
- β Stable 3.7V Output β Consistent voltage delivery throughout the full discharge cycle
- β Built-in PCM Protection β Overcharge, over-discharge, overcurrent & short-circuit protection
- β Long Cycle Life β β₯500 cycles at β₯80% capacity retention
- β Low Self-Discharge β β€3% per month, ideal for always-on and low-power standby devices
- β Precision Dimensional Tolerance β Β±0.2mm, critical for tight-tolerance device housings
- β CE & UN38.3 Certified β Air freight compliant, meets global import standards
- β OEM/ODM Ready β Custom dimensions, capacity, connector, PCM & branding available
Specifications
| Parameter | Value |
|---|---|
| Model | 621437 |
| Nominal Voltage | 3.7V |
| Capacity | 280mAh |
| Energy | ~1.04Wh |
| Charging Voltage | 4.2V Β± 0.05V |
| Discharge Cut-off Voltage | 3.0V |
| Standard Charge Current | 0.5C (140mA) |
| Max Charge Current | 1C (280mA) |
| Max Discharge Current | 1C (280mA) |
| Dimensions | 6.2 Γ 14 Γ 37 mm |
| Weight | ~5g |
| Operating Temperature | -20Β°C ~ +60Β°C |
| Storage Temperature | -10Β°C ~ +45Β°C |
| Self-Discharge Rate | β€3% / month |
| Cycle Life | β₯500 cycles @ β₯80% capacity |
| Certification | CE / UN38.3 / RoHS |
Applications
| Device Category | Typical Use Cases |
|---|---|
| β Smartwatches & Fitness Bands | Compact wearables, kids GPS watches, activity trackers |
| π§ TWS Earbuds & Hearing Aids | True wireless earphones, OTC hearing aids, audio wearables |
| π IoT Sensors & Nodes | BLE beacons, temperature loggers, environmental monitors |
| π₯ Medical Wearables | Continuous glucose monitors, ECG patches, vital sign trackers |
| π· Micro Cameras | Spy cameras, body-worn cameras, endoscope modules |
| π Smart Access Devices | Key fobs, NFC cards, smart locks, RFID trackers |
| π Digital Health Devices | Smart inhalers, medication reminders, patch devices |
Quality Assurance
Every cell is subject to a rigorous multi-stage inspection and testing protocol:
| Test Item | Standard |
|---|---|
| Capacity Verification | 100% units tested β₯ rated 280mAh |
| Open Circuit Voltage | OCV β₯ 3.85V before shipment |
| Internal Resistance | β€ 250mΞ© |
| Dimensional Tolerance | Β±0.2mm on all axes |
| Appearance Inspection | Zero defect on surface, tabs & sealing edges |
| PCM Function Test | Overcharge / over-discharge / short circuit verified |
| Cycle Endurance | 500-cycle batch sampling (per IEC 62133) |
| Safety Testing | Nail penetration / crush / thermal abuse (sampling) |
OEM & Custom Micro Battery Solutions
We specialize in ultra-compact custom battery development for medical, wearable, and IoT device manufacturers:
- Custom Dimensions β Minimum thickness from 3.0mm; custom width & length to match PCB layout
- Capacity Range β 80mAh ~ 500mAh for ultra-thin and miniature form factors
- Connector & Wiring β JST-PH 1.25, ZH 1.5, Molex 51021, FPC flex connector, bare wire leads
- PCM Options β Ultra-thin PCM (β€1.5mm profile), NTC thermistor, fuel gauge IC integration
- Shape Options β Rectangular, L-shaped, curved/bent cells for ergonomic device housings
- Branding β Private label, custom shrink wrap color, logo printing
- MOQ β 200 pcs standard models ο½ 500 pcs full OEM custom cells
Packaging & Shipping
| Item | Detail |
|---|---|
| Inner Packaging | Individual anti-static poly bag + foam tray |
| Outer Packaging | Standard export carton (customizable for retail) |
| Carton Qty | 200 ~ 500 pcs / carton |
| Shipping Methods | DHL / FedEx / UPS express ο½ Air cargo ο½ Sea freight |
| UN38.3 Compliance | β Certified for air freight worldwide |
| Lead Time (Sample) | 3 β 5 business days |
| Lead Time (Bulk) | 7 β 15 business days |
Why Choose Us
- π 12+ years specialized in miniature and ultra-thin lithium polymer battery manufacturing
- π¬ In-house micro-battery R&D lab β capable of developing cells as thin as 0.4mm
- π ISO 9001 certified β full traceability from raw material to finished cell
- π₯ Experience supplying medical-grade batteries meeting IEC 62133 & ISO 13485 requirements
- βοΈ UN38.3 certified β DHL / FedEx / UPS air express to 200+ countries
- π Trusted by wearable, medtech & IoT brands across EU, North America & Asia Pacific
- π Free DFM (Design for Manufacturability) review for custom battery integration
- π¬ Engineering response within 4 business hours
π¬ Share your device PCB dimensions, available battery compartment space, or target runtime β our micro-battery engineers will develop the optimal solution and provide a detailed quotation within 24 hours.
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