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Image Part # and datasheet Voltage Capacity Diameter Distributors
cr2032_t.jpg CR1220 3V lithium ~25mAh 12.5mm Mouser Digikey
cr2032_t.jpg CR2032 3V lithium ~200-235mAh 20mm Mouser 200mah Mouser 235mah (crossed out due to that part being obsolete)Mouser 225mah Digikey (this part is actually CR1220, not CR2032)