554551 7.4V Lithium Battery Pack

The 7.4V lithium battery pack uses high-quality lithium-ion cells to deliver stable electrical performance and consistent energy output. Manufacturers commonly arrange the cells in a 2S configuration, which provides a nominal voltage of 7.4V and a charging voltage of 8.4V. In addition, the pack supports reliable charge and discharge management through an integrated protection circuit. Most designs maintain controlled internal resistance and stable current transmission during operation.

Materials and Cell Structure

This battery pack mainly adopts premium 18650 lithium-ion cells with durable metal casing and heat-resistant insulation materials. Engineers usually select A-grade cells to improve consistency between individual units and maintain balanced voltage performance. Furthermore, manufacturers apply nickel strip spot welding technology to strengthen electrical connections and reduce contact resistance. The outer layer often includes PVC wrapping or insulated housing to protect the internal structure from vibration, moisture, and external contamination.

Manufacturing Process

Producers follow a controlled assembly process to ensure stable battery quality. First, technicians carefully match the cells according to voltage, capacity, and impedance. Next, automated spot welding machines connect the cells with precision while minimizing thermal damage. After assembly, the Battery Management System (BMS) is installed to regulate charging, discharging, over-current, and temperature protection. Finally, factories conduct aging tests, voltage calibration, and safety inspections before packaging the finished battery pack.

Technical Standards

Most 7.4V lithium battery packs comply with international quality and transportation standards such as CE, UL, RoHS, CB, and UN38.3 certifications. Additionally, manufacturers usually design the batteries with operating temperature ranges between -20°C and 60°C. Standard charging methods generally use CC/CV technology to maintain charging stability and extend cycle life. Under proper operating conditions, many battery packs can achieve around 500 charge cycles while maintaining dependable capacity retention.

Product Features

• 7.4V High Voltage: Two cells connected in series provide higher voltage, suitable for medium to high power consumption devices.
• 1400mAh Capacity: Long battery life meets daily usage needs.
• Slim and Compact: Measuring only 12×45×55mm, suitable for space-constrained devices.
• Customizable: Supports custom manufacturing to meet different device requirements.
• Safe and Stable: Built-in protection circuit with overcharge, over-discharge, and overcurrent protection.
• Long Cycle Life: Can be charged and discharged multiple times, economical and environmentally friendly.

Application Scenarios

• Power tools
• Portable medical devices
• Handheld testing instruments
• Smart home devices
• Consumer electronics
• Industrial equipment accessories