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Your system uses a 12v DC back-up battery. They are available from us, a battery store or a box stores such as Home Depot. If you purchase one yourself, get a 12v DC with 6 to 8ah capacity. They look like this.
When replacing, use caution as they are heavy. Connect the red wire to the red terminal and black to black.
Put a date on it so you know when you replaced it.
If you have this type, it uses a CR123
Open the sensor from the banded
end. Gently insert a small screw driver
into the slot and twist. Replace the battery and secure cover from
banded end hinging towards the other end. You will see notches inside the cover to help align it.
If you have this type (below), it uses a CR2032. It looks like a coin. Note the
small mark on the side of the sensor. It aligns up with the magnet
to complete the connection. Helpful when you put the sensor back.
Please follow these steps to replace the battery.
1. Gently open cover
2. Pop battery out
3. Replace battery under gold clips first, the
snap in. See the clips
4. Verify you can see the writing on the battery
5. Align cover, see arrows
6. Snap cover into place. It will be flush all around.