Summary — 403035 400mAh 3.7V Lithium Polymer Battery with PCB

The 403035 400mAh 3.7V Lithium Polymer Battery with PCB is a lightweight, soft-pack (aluminum-plastic) rechargeable Li-Po cell designed for compact and medium-size electronic devices. Its 403035 form factor offers a slim profile suitable for space-limited applications, while its high-cycle chemistry ensures that even after 500 deep cycles, the capacity remains above 320mAh. Equipped with a built-in protection circuit (PCM/PCB) providing over-charge, over-discharge, short-circuit, over-current, and over-temperature protection, this battery is ideal for portable consumer electronics, IoT devices, handheld instruments, and smart wearables.

403035 400mAh Technical Information

Model: 403035 400mAh

Battery Type: Rechargeable Li-Polymer Battery

Nominal Capacity: 400mAh

Nominal Voltage: 3.7V

Nominal Energy: 1.48Wh

Protection Circuit Board (PCB): Built-in overcharge, over-discharge, over-current, short circuit protection

Charge Cut-off Voltage: 4.2V

Discharge Cut-off Voltage: Typically 3.0V, Minimum 2.75V

Standard Charge Current: 0.2C (80mA)

Max Charge Current: 1C (400mA)

Standard Discharge Current: 0.2C (80mA)

Max Continuous Discharge Current: 1C (400mA)

Max Peak Discharge Current: 2C (800mA)

Internal Resistance: Less than 200mΩ

Cycle Life: More Than 500 Times

Dimensions: 4 × 30 × 36 mm

Weight: 13g

Charge Temperature Range: 0°C to 45°C

Discharge Temperature Range: -20°C to 65°C

Storage Temperature Range:

• -20℃~25℃: More than 12 months
• -20℃~45℃: Less than 3 months
• -20℃~60 ℃: Less than 1 month

Connector: Bare wires or optional with JST, Molex etc

Key Features – 403035 3.7V Lithium Battery​

🎈 Lightweight Soft-Pack Construction (Aluminum-Plastic Pouch)

The battery uses a soft-pack aluminum-plastic film, making it significantly lighter than cylindrical or steel-shell cells. This design offers improved safety, flexibility, and thermal stability, enabling integration into modern compact devices. Extremely lightweight for portable and wearable electronics, excellent mechanical flexibility and shock resistance, safer thermal behavior, slim profile ideal for embedded device designs.

📏 Slim 403035 Size — Perfect for Size-Constrained Devices

With dimensions of 4.0 × 30 × 35 mm, the 403035 Li-Po battery delivers high capacity in a compact footprint, ideal for small to medium devices requiring reliable energy storage. Its balanced ratio between capacity and size makes it one of the most versatile Li-Po batteries in this class.

🔁 Long Cycle Life — 500 Cycles Remaining Above 320mAh

Even after 500 deep charge–discharge cycles, the battery retains over 320mAh, ensuring long-term performance, excellent durability, and reduced maintenance.

🛡️ Integrated PCB Protection for Safe Operation

This Li-Po battery features a built-in Protection Circuit Board (PCB) that ensures safe and stable operation across various environments. The enhanced circuit design reduces risk and ensures reliability for consumer-grade and industrial-grade electronics.

❓ Frequently Asked Questions (FAQ)

1. What devices are compatible with the 403035 400mAh 3.7V LiPo Battery?

This battery is suitable for a wide range of compact electronics, including:

• GPS trackers

• Smart wearables

• Medical monitoring devices

• Wireless earbuds and Bluetooth headsets

• Portable sensors and IoT modules

If your device requires a 3.7V lithium polymer battery with dimensions close to 4×30×36mm, this cell is likely a perfect match.

2. Can I customize the wire length and connector type?

Absolutely. We offer OEM/ODM services, including:

• Custom wire length and gauge

• JST, Molex, Hirose, or other connector types

• Specialized PCBs for different cutoff voltages or discharge rates
  Contact our sales team to discuss your application needs.

3. What certifications does this battery have?

All our lithium polymer batteries, including the 403035 400mAh 3.7V model, are shipped with:

• MSDS (Material Safety Data Sheet)

• UN38.3 (for safe air/sea transportation)

• RoHS compliance (environmental safety)
  Other certifications like PSE or IEC62133 can be provided for bulk orders.

4. How should I charge this lithium polymer battery?

Use a dedicated 3.7V LiPo battery charger with a charge voltage of 4.2V (±0.05V) and a recommended charge current of 0.2C to 0.5C. Overcharging or using incompatible chargers may damage the cell or reduce safety.

5. Is this battery safe to transport internationally?

Yes. The 403035 3.7V LiPo Battery with PCB is certified for safe international shipping and complies with IATA/UN38.3 standards. It is classified as UN3480 (Lithium Ion Batteries) and properly packaged according to air/sea freight requirements.

6. Can this battery be used in parallel or series configuration?

Yes, but only under the guidance of a qualified engineer. For multi-cell applications (series/parallel), balancing and custom PCM/BMS designs are critical. We also provide multi-cell pack design and assembly services upon request.

7. What is the lead time for bulk orders?

Lead time varies based on quantity and customization needs:

• Samples: 5–10 working days

• Bulk production: 10–20 working days
  Faster delivery can be arranged for urgent orders.

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