Lithium Polymer Lipo Rechargeable Battery Model KP 357090 3.7V 4000mAH 

The KP 357090 3.7V 4000mAH Lithium Polymer Battery is a high-capacity, lightweight, and slim rechargeable battery designed for power-intensive portable electronic devices. The model code “357090” indicates its approximate size—3.5 mm thickness, 70 mm width, and 90 mm length—making it suitable for large yet slim products such as tablets, e-readers, smart displays, IoT devices, and portable medical instruments.

With a strong 4000mAH capacity, the battery provides exceptional runtime, stable performance, and efficient power delivery. Its high energy density, low self-discharge rate, and dependable Lithium-Polymer chemistry ensure long cycle life and reliable operation in demanding applications.

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Features

• High-capacity 4000mAH Li-Po cell
• Slim rectangular design for compact devices
• Stable 3.7V nominal output
• High energy density for extended runtime
• Lightweight and efficient
• Low internal resistance with consistent discharge performance
• Supports CC/CV charging at 4.2V
• Low self-discharge for long standby time
• Long cycle durability with proper management
• Optional built-in protection circuit for safety

Specifications

• Model: KP 357090
• Nominal Voltage: 3.7V
• Capacity: 4000mAH
• Battery Type: Lithium Polymer (Li-Po)
• Full Charge Voltage: 4.2V
• Charging Method: CC/CV (Constant Current / Constant Voltage)
• Standard Charge Rate: 0.5C
• Max Charge Rate: 1C
• Max Discharge Current: Typically 1C–2C (varies by manufacturer)
• Cycle Life: 300–500 cycles
• Dimensions (Approx.):
• Thickness: 3.5 mm
• Width: 70 mm
• Length: 90 mm
• Weight: 60–80 g (approx.)
• Operating Temperature:
• Charge: 0°C to +45°C
• Discharge: –20°C to +60°C

Applications

• Tablets, e-readers, and portable displays
• IoT devices and smart home equipment
• Portable medical and diagnostic devices
• GPS navigation units
• Bluetooth speakers and multimedia gadgets
• Handheld terminals and rugged devices
• Power banks and backup systems
• Robotics, embedded systems, and DIY electronics