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621437 3.7V 280mAh LiPo Battery
$0.85
621437 3.7V 280mAh LiPo battery, slim 6.2mm cell for Bluetooth earphone cases, smartwatch backup modules and IoT sensor nodes. CE/RoHS/UN38.3 certified.
621437 3.7V 280mAh LiPo battery from HNF Battery (model 621437) is engineered for compact, reliable power in a slim footprint. This pack pairs dependable PCM protection with consistent capacity, making it a trusted choice for OEM integrators worldwide.
The HNF-621437 is a slim 6.2mm lithium polymer battery offering 280mAh at 3.7V in a narrow 14 x 37mm strip. Its slender form factor is well-matched to compact wireless devices such as Bluetooth earphone charging cases, smartwatch backup modules, slim medical tracking patches, and compact IoT sensor nodes. 250mΩ impedance with PCM protection provides reliable power in space-constrained enclosures.
Model number: HNF-621437 280mAh 3.7V
Nominal voltage: 3.7 V
Nominal capacity: 280 mAh
Dimension: 6.2 x 14 x 37 mm
Cell configuration: 1S1P
Certification: CE / RoHS / IEC62133 / UN38.3 / MSDS
Warranty: 12 months
Specifications
| Item | Rating | Remark |
|---|---|---|
| Model | HNF-621437 280mAh 3.7V | |
| Nominal Capacity | 280 mAh | Standard discharge (0.2C5A) after standard charge |
| Nominal Voltage | 3.7 V | |
| Dimension | 6.2 x 14 x 37 mm | |
| Weight | Approx: 5 g | |
| Cut-off Charge Voltage | 4.2 V | |
| Cut-off Discharge Voltage | 3.0 V | |
| Initial Impedance | ≤ 250 mΩ | |
| Standard Charge | 0.2C CC charge to CV then CV till current ≤0.01C | Charge time: approx. 7.0 h |
| Standard Discharge | Discharge at 0.2C5A to cut-off voltage | |
| Cycle Life | ≥500 cycles, 80% capacity retention | |
| Operating Temperature | Charge 0~+45℃ / Discharge -20~+60℃ | |
| Storage Temperature | -10~+45℃ | |
| Storage Humidity | 45-75% RH |
Application Field
Bluetooth earphone charging cases, smartwatch internal backup modules, slim medical tracking patches, compact IoT sensor nodes, mini wireless transmitters.
Main Advantages
- High energy density, stable 3.7V nominal voltage
- High-drain capable, stable discharge performance
- Lightweight and ultra-thin; dimensions customizable on request
- Extremely safe, low self-discharge, long cycle life (≥500 cycles, 80% capacity retention)
- Reliable PCM protection against over-charge and over-discharge
- Wide operating temperature: -20℃ ~ +60℃
FAQ
Q: Do you accept customization?
A: Yes. We are a professional custom lithium battery manufacturer. Share your required voltage, capacity, and dimensions.
Q: Can this be shipped by air?
A: 1.04 Wh — well within the 100Wh limit, suitable for air freight with MSDS & UN38.3 documentation.
Q: Do you offer samples?
A: Samples are available; sample cost is refunded once a bulk order is confirmed.
Q: What is the MOQ?
A: In-stock items have no MOQ. For customized cells, MOQ is typically 3,000-10,000 pcs depending on size and capacity.
Q: How is quality assured?
A: Multi-stage quality control across R&D, incoming inspection, production, pre-shipment, and after-sales, fully certified with CE, RoHS, and IEC62133.
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