303040 3.7V 300mAh LiPo Battery

The HNF-303040 is an ultra-thin 3mm lithium polymer battery offering 300mAh at 3.7V across a wide 30 x 40mm surface. The thin-yet-wide format enables higher capacity in an ultra-slim package, making it ideal for slim wearables such as smartwatches, fitness bands, health monitoring patches, and compact medical devices. With 250mΩ impedance and PCM protection, it delivers safe, stable power for body-worn applications.

Model number: HNF-303040 300mAh 3.7V
Nominal voltage: 3.7 V
Nominal capacity: 300 mAh
Dimension: 3.0 x 30 x 40 mm
Cell configuration: 1S1P
Certification: CE / RoHS / IEC62133 / UN38.3 / MSDS
Warranty: 12 months

Specifications

Application Field

Smartwatches and fitness bands, health monitoring patches, compact GPS trackers, wearables for elderly care, wrist-worn IoT devices.

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: 1.11 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.