BATTERY-CR2430

CR2430 Lithium 3V Coin Cell Battery. These are commonly used in car key fobs, heart rate monitors, and small electronic sensors.
​Here is a breakdown of what those markings mean and how to handle it safely:
​Understanding the Label
​CR: This indicates the chemical composition (Lithium Manganese Dioxide).
​2430: This tells you the physical dimensions. The first two digits (24) mean it is 24mm in diameter. The last two digits (30) mean it is 3.0mm thick.
​3V: The nominal voltage of the battery.
​+ Symbol: The flat, engraved top surface is the positive terminal