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CR1220 3V Lithium Batteries
The CR1220 lithium battery is a more unusual Lithium coin cell.
The CR1220 lithium cell, like any lithium coin cell, is rated at 3.0V, which is why it is sometimes called a CR1220 3V lithium battery. The four digits in the battery designation actually give the dimensions of the coin cell. The first two digits, 12, mean that the coin cell is 12mm in diameter.
The last two digits, 20, mean that the CR1220 cell is exactly 2.0mm high. Lithium is the name of a metal used in the manufacture of the CR1220.