The 3.7V 380mAh battery is a very common power source for many budget-friendly and generic smartwatches (such as the popular DZ09, GT08, and V8 models). These batteries are typically Lithium-Polymer (Li-Po) cells, designed to be thin and lightweight to fit inside the watch casing.

Key Details for Replacement

If you are looking to replace this battery, keep these factors in mind to ensure compatibility:

• Model Number Check: Often, these batteries are labeled with a model code (e.g., LQ-S1 is a very common designation for the 380mAh smart watch battery). Always check the label on your existing battery.

• Dimensions: While capacity (380mAh) is important, the physical size is critical. Measure your current battery’s length, width, and thickness (usually in millimeters) to ensure the new one will fit in the watch frame.

• Connector Type: Some batteries have a small white JST connector, while others are "bare" (requiring you to solder the wires directly to the watch’s PCB). Verify if yours has a connector or just two wires (Red/Black).

• Voltage: The nominal voltage is 3.7V, with a fully charged voltage of 4.2V. Do not attempt to use a battery with a different voltage, as it may damage the watch's charging circuit.