SEM Security Systems
a division of Southeast Mobility
So, your yellow light is on, the keypad is beeping, you've
pressed *2 and the keypad is displaying a 1, you pressed 1
and it continues to display a 1 or it reads out Low Battey.
The backup battery is located in the main panel, something
that you probably haven't seen in a while and may not have
a clue where it's at. First thing, it's not the keypad. The
main panel is a putty colored metal can that is usually
mounted inside a closet or a utility room. More often it is
located right against the ceiling but may be mounted near
the floor or anywhere else on the wall. The main panel is
where all of the wiring from the contacts and sensors run
Now that you have found the main panel, you have two
options for replacing the battery. You can contact us and
schedule a service call or you can replace it yourself. As is
the case for most things, it will be cheaper to replace it
yourself but if you are uncomfortable doing this, we will be
glad to do it for you. In the event that you want to replace it
yourself, keep reading.
Open the door on the main panel by removing one or two
screws on the right hand side that are holding it shut.
These are easily removed with just about anything but a
philips screw driver is best. Once the door is open you will
see the battery inside. This is a 12 volt battery with plug on
terminals. It will either be shaped like a cube or a rectangle.
The cube shaped battery is either a 4 or 5 amp hour battery
and can be replaced with either a 4 or 5 amp hour, that is to
say that if yours is a 4, you can replace it with a 5 if that is
what you find handy or visaversa. The rectangle shaped
battery will be a 7 amp hour. The 7 amp hour battery should
be replaced with a 7 amp hour.
You can purchase a replacement battery from different
sources. Of course you can purchase it from our office,
Radio Shack and box stores often have these as well. They
are pretty commonly used in emergency lights, ups units for
computer backup, and kids riding toys.
To take out the old battery, simply unplug the two wires on
top and remove it from the panel enclosure.
To install the new battery, reverse the process being very
careful to plug the red wire from the panel onto the red
terminal on the battery marked "+" or "positive. If you get
these two wires reversed, then you will require a service
call and a much larger expense as it will fry the main circuit
board which will have to be replaced. There is also a
possibility of personal injury so just be sure that you get the
two wires onto the correct terminals.
Now, close the door, replace the screws and you're done
with the replacement. Go back to your keypad and check
the trouble light. If the keypad is still indicating a low battery
condition, give it an hour.
Normally you are done at this point. Sometimes a new
battery will not be at full charge and will have to be
recharged by the panel. If after an hour or so the keypad is
still indicating a low battery then either you have a
defective battery or the charging circuit on the main circuit
board has malfunctioned. At this point you will have to
decide to either try another battery or contact us and
schedule a service call.