Currently, many 5th and 7th rechargeable lithium batteries on the market have a constant voltage output of 1.5V, providing stable power for electrical appliances. This mainly depends on the built-in circuit design and the characteristics of the battery itself.
Built in voltage regulator circuit
This type of battery integrates a small electronic voltage regulator circuit inside, which is responsible for monitoring the battery voltage and adjusting the output voltage to ensure a stable 1.5V output voltage even when the battery power gradually decreases. This circuit can be a simple linear regulator or a more efficient switch mode power converter.
Lithium ion/polymer battery cells combined with voltage regulator circuits
In fact, most rechargeable AA lithium batteries use lithium-ion or lithium polymer cells with a nominal voltage of 3.7V. In order to achieve a 1.5V output, manufacturers will add a DC-DC converter inside the battery, which will lower the higher cell voltage to the required 1.5V stable output.
Intelligent charging management chip
In addition to stabilizing the output, these batteries are also equipped with intelligent charging management chips to control the charging process. These chips not only ensure safe and fast charging, but also prevent overcharging, overdischarging, and other potential safety hazards. When the battery is fully charged, it will automatically stop charging and maintain the battery in a safe state for storage.
Constant voltage output technology
Some high-end models may use more advanced constant voltage output technology, such as using high-precision feedback control systems to monitor changes in output voltage and make timely compensation to maintain a constant voltage. This technology can provide very stable voltage output even when the load changes, thereby improving the reliability and performance of equipment operation.
In summary, by integrating advanced electronic components and optimizing the internal structure of the battery, USB lithium batteries can provide stable and reliable power support for various small electronic products that require 1.5V power supply in practical use.
