Why is there a battery on a phone's circuit board?

When disassembling a phone, users notice a battery of approximately 1.5 volts on the board. This begs the question: what is it for?

This power supply element is used for the following:

1. Supports the settings that were set by the owner of the smartphone or simple mobile phone.
2. Prevents the date from getting lost.
3. Maintains the same battery life. This feature is quite useful, as data cannot be lost when the main battery is removed.

Essentially, it's a kind of insurance policy and is needed on boards with volatile memory. But what's inside isn't always called a battery. Sometimes a supercapacitor is soldered onto the board. This component is a powerful capacitor. It contains an organic or inorganic electrolyte. In some circuits, it's more practical to use the latter. The supercapacitor receives current from the controller.