Introduction
Lithium Ion Polymer Battery 3.7 V 400mah is a high-energy density, rechargeable soft-pack power source. It features a slim, lightweight profile that can be tailored to fit ultra-compact electronic enclosures.
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Items |
Specifications |
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Batteries |
3.7V 400mAh Li-ion Polymer Battery |
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Charge voltage |
4.2V |
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Nominal voltage |
3.7V |
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Nominal capacity |
Nominal Capacity: 400mAh Minimum Capacity: 360mAh |
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Charge current |
Standard Charging: 0.5C Rapid charge: 1.0C |
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Standard Charging method |
0.5C CC (constant current) charge to 4.2V, then CV (constant voltage 4.2V) charge till charge current decline to ≤0.05C |
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Charging time |
Standard Charging: approx. 2.75 hours Fast Charging: approx. 2 hours |
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Max.charge current |
1.0C |
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Max.discharge current |
1.0C |
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Discharge cut-off voltage |
2.75V(0.2C) |
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Charging Temperature |
0 °C ~45 °C |
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Discharging Temperature |
-10°C~ +45 °C |
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Dimension |
Length: 50±2mm (not including tabs) Width: 20±0.5mm Thickness:10±0.2mm |
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Drop Test |
The cell is to be dropped from a height of 1 meter twice onto concrete ground. No fire, no leakage |
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Cycle Life |
≥300times |
Key Features
Voltage Plateau Stability
Maintains a consistent 3.7V output to ensure sensitive PCB components and RF modules operate without interference.
High Volumetric Energy Density
Optimized internal structure allows for more runtime in a 5.0mm ultra-thin footprint.
Safety Engineering
The soft-pack aluminum foil design prevents internal pressure buildup, offering superior safety over cylindrical lithium cells.
Customization Options
Custom Dimensions: Flexible design to fit your device's exact size and shape requirements.
Connector Options: Select from JST, Molex, or PH series connectors, tailored to your assembly needs.
Protection Circuit Modules (PCM): Customize to suit specific protection requirements for your device.
Temperature Regulation: Integration of NTC thermistors for accurate thermal management.
Battery Packs: Configurations for multi-cell setups (e.g., 7.4V, 11.1V) for higher power needs.
Applications
Smart Wearables: Smartwatches, fitness trackers, and smart rings.
Medical Electronics: Portable pulse oximeters, digital thermometers, and glucose monitors.
IoT & Sensors: Wireless security sensors, asset trackers, and smart lock modules.
Consumer Tech: Bluetooth earbuds, mini dash cams, and portable beauty devices (facial cleansers).
Global Logistics & Compliance
We provide full documentation to streamline your import process and ensure legal distribution:
Safety: IEC62133, CE, REACH, and RoHS compliance.
Transportation: UN38.3 and MSDS reports for both air and sea freight.
Packaging: Anti-static trays and standardized Dangerous Goods (DG) packaging for international transit.
FAQ
Q: Is the 400mAh capacity tested under load?
A: Yes. We perform 100% capacity grading. Each cell is tested at 0.2C discharge to ensure it meets the minimum 360mAh threshold and typical 400mAh performance.
Q: How do you ensure batch-to-batch consistency for large orders?
A: Our automated production line sorts cells based on Internal Resistance (IR) and Voltage (OCV), ensuring that all units in your batch have synchronized discharge curves.
Q: Can I request a specific connector to reduce my assembly time?
A: Absolutely. We can supply the battery with your choice of terminal (JST, Molex, etc.) so it arrives ready for "Plug-and-Play" on your assembly line.
Q: What is the typical lead time for engineering samples?
A: Standard 400mAh cells with custom wires usually ship within 5-7 working days. Bulk production lead time is typically 20-25 days depending on the customization level.
Q: How should I clean the battery?
A: To clean the battery, simply wipe the outer surface with a dry cloth. Avoid using any liquids or harsh cleaning agents that may damage the battery or its protective circuitry.
Q: Does this battery have short-circuit protection?
A: Yes, this battery is equipped with an integrated short-circuit protection circuit. In the event of a short circuit, the battery will automatically disconnect the current, ensuring safe operation and preventing any potential damage.
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