Button Cells

Button cells (watch batteries) are coin-shaped cells that are thin compared to their diameter. The metal can is the positive terminal, and the cap is the negative terminal. CR denotes manganese dioxide lithium chemistry. Since LiMnO2 cells produce 3 volts there are no widely available alternate chemistries for a CR coin battery. Conversely, one LiMnO2 cell can replace two alkaline or silver-oxide cells. All lithium cells are rated nominally 3 volts (on-load), with open circuit voltage about 3.6 volts. The IEC "CR" prefix indicates a round, lithium/manganese dioxide cell. Some sizes are also designated with a "BR" prefix, indicating a round lithium/carbon mono-fluoride cell. See lithium battery for discussion of the different performance characteristics. Manufacturers may have their own part numbers for IEC standard size cells. The capacity listed is for a constant resistance discharge down to 2.0 volts per cell. For further information check out Wikipedia here and for sizes here.

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