The 3V CMOS Battery CR1220 is a lithium coin cell used in various electronic devices, such as watches, calculators, motherboards (for maintaining BIOS settings), and other low-power electronics. The CR1220 is a compact and reliable battery, often used where a small, long-lasting power source is required.

Here’s some detailed information about the CR1220 battery:

Key Features:

• Voltage: 3V
• Type: Lithium (Li)
• Chemistry: Lithium Manganese Dioxide (LiMnO₂)
• Diameter: 12mm
• Height/Thickness: 2.0mm
• Capacity: Typically around 40mAh (milliamp-hours), depending on the manufacturer
• Nominal Voltage: 3V, which is ideal for CMOS memory applications in computers, watches, and other electronics.
• Application: Commonly used in low-drain applications, such as maintaining the date and time in motherboards, RTC (Real Time Clock) chips, or providing backup power for settings when the main power supply is off.

Solder Type:

• Solder type means that the battery has exposed contacts that can be directly soldered onto a circuit board. This feature makes it different from typical coin cells, which are often used in battery holders or clips. Soldering the cell is common for use in embedded designs or devices where the battery needs to be permanently affixed to the board or where a battery holder might not be practical.