554551 7.4V Spare Battery

The 7.4V Spare Battery employs high-quality lithium-ion cells to provide stable electric performance and stable energy output. Manufacturers usually pack the cells in 2S format, giving a nominal voltage of 7.4V and a charging voltage of 8.4V. Besides, the pack accommodates effective charge and discharge control via an inbuilt protection circuit. The majority of designs have controlled internal resistance and constant current transmission when operating.

Materials and Cell Structure

The battery pack primarily incorporates high-quality 18650 lithium-ion batteries that have a strong metal casing and heat-resistant insulation materials. To enhance the consistency of individual units and balance the voltage performance, engineers typically choose A-grade cells. Moreover, nickel strip spot welding technology is used by manufacturers to enhance electrical connections and minimize contact resistance. The exterior is usually covered with PVC wrapping or insulated housing to shield the inner structure against vibration, moisture, and external contamination.

Manufacturing Process

The production process is a regulated assembly by the producers to maintain the consistent quality of the batteries. The technicians initially match the cells carefully based on voltage, capacity, and impedance. The cells are then welded to the automated spot welding machines with precision and reduced thermal damage. Once assembled, the Battery Management System (BMS) is fitted to control charging, discharging, overcurrent, and temperature protection. Lastly, the finished battery pack is packaged after factories perform aging tests, voltage calibration, and safety tests.

Technical Standards

The majority of 7.4V lithium battery packs are in line with international quality and transportation regulations like CE, UL, RoHS, CB, and UN38.3 certifications. Also, manufacturers typically set the operating temperature of the batteries at -20 o C to 60 o C. The common charging is typically based on CC/CV technology to provide stability in charging and increase the cycle life. In the right operating environment, several battery packs can reach approximately 500 charge cycles and still have reliable 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