Simply buy Button cell / special battery CR2032 CR2032

Basics: Coin Cell Battery Bank : 9 Steps (with Pictures) - Instructables

Everything You Need To Know About The CR2032 Battery

Toshiba CR2032 220mAh 3V Lithium (LiMnO2) Coin Cell Battery

Energizer Watch Electronic Lithium Coin 2032 Batteries - 4 Pack, 4 pk - Kroger

CR2032 battery holder

CR2032 Battery Lithium CR2032 Coin Cell Battery

Duracell CR2032 3V Lithium Battery, 4 Count Pack, Bitter Coating Helps Discourage Swallowing 004133366391 - The Home Depot

AirTag battery replacement: avoid bitterant coatings - iPhone J.D.

Simple but effective - this sewable breakout board has a CR2032 coin cell battery holder soldered on and 0.1 pitch breakout pins for easy connecting. Great for powering very low-current projects, or adding a battery backup circuit to a real-time clock or similar. Comes with one fully assembled and tested coin cell battery holder and a small stick of 0.1 header so you can solder it on and plug into a breadboard. Coin cell battery is not included.

Adafruit 20mm Coin Cell Breakout Board CR2032 Ada1870