The closest battery equivalent to a CR1220 battery is the Energizer 1220 battery. The 3-volt lithium coin-sized battery can be used in heart-rate and glucose monitors, keyless entry devices, games and toys. Amazon.com offers equivalent replacement batteries, including the Sony CR1220 Equivalent CMOS battery, which is warranted for one year.
The Energizer 1220 specialty battery can last up to eight years when stored. Walmart.com sells the Lenmar WCCR1220 Lithium coin cell battery as an equivalent replacement. BatteryMart.com sells a lithium coin cell battery that has a capacity of 36 milliamp hours. It replaces CR1220 batteries used in small electronics and watches.