Hello Dean, The battery is a three cell, 3.6v rechargeable that may not be available locally. The Caleffi part number for a replacement battery is F69888. The battery should hold the memory for 15 days of lost power and have a 2 year life expectancy. If the battey is not backing the conrol up you should get a "battery alarm" or have the red light lit up next to the battery picture on the front of the control indicating a battery failure. If the there is no battery alarm or failure indicator and the battery is not holding the memory you should confirm the battery installation orientation. The + side of the battery should be installed facing the bottom the the control or the battery switch.
Hello Dean, The battery is a three cell, 3.6v rechargeable that may not be available locally. The Caleffi part number for a replacement battery is F69888. The battery should hold the memory for 15 days of lost power and have a 2 year life expectancy. If the battey is not backing the conrol up you should get a "battery alarm" or have the red light lit up next to the battery picture on the front of the control indicating a battery failure. If the there is no battery alarm or failure indicator and the battery is not holding the memory you should confirm the battery installation orientation. The + side of the battery should be installed facing the bottom the the control or the battery switch.
Dan Firkus Caleffi technical support