What are the differences between RCR123, R16340 and R17345 batteries?
RCR123 is a common name for a rechargeable Li-ion CR123 battery. The CR123 battery size is also known as a 17345. In the international cell size designations, the first two digits are the diameter in millimeters and the last three digits are the length in tenths of a millimeter. Thus a R17345 battery will be 17mm in diameter and 34.5mm long. A typical protected RCR123 (R17345) is manufactured using a 16340 rechargeable Li-ion cell. By the time you add the protection circuit, the resulting battery grows to the 17345 size. It is incorrect to refer to these batteries by the internal cell size. They should always be referred to by their true external size.
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