NOTE: Before changing out a battery in a nGWY2 CTRL, please make sure the unit has been powered down for a few minutes.
Battery Type - BR1225
If the nGWY2 CTRL does not hold its date/time upon loss of power, the battery in the unit should be replaced. See attached video that demonstrates how to replace this battery. Please note, all programming, schedules, profiles, etc. are stored within non-volatile memory on the Gateway. None of this programming will be lost if the Gateway has a dead battery.