How to replace home alarm battery

How to replace home alarm battery

In this video we will show how to find the
best replacement battery for a home or business security alarm system. We will demonstrate how to determine the specification
of the sealed lead acid battery used in a typical home or business alarm system. Then we will show you how to take this information
and use’s battery specification search tool to select the best replacement
option for your needs. Open up the alarm control panel and take a
look at the existing battery. It may look similar to this one. Look closely at the battery.
You should easily find printed information regarding the chemistry of the battery along
with voltage and amperage specific to your battery. In this case our battery is a “Nonspillable
Rechargeable Sealed Lead Acid Battery”. It is also a 12V / 4.5AH battery. You don’t need
to pay attention to the brand at this point. Most 12V /4.5AH batteries will be the same
size, however it is a good idea to take a ruler and measure the physical dimensions
(length,width and height) of your battery for reference later. You may also take note of the type of terminal
connector your battery has. Most Sealed Lead Acid Batteries for small security system applications
use blade connectors for terminals. These blades come in two sizes F1 and F2. The size
of the blade will determine how much current the battery will support. Generally speaking,
less than 5Ah typically uses an F1 terminal, 5AH to 10AH is a gray area where you may see
both F1 and F2 types used. For 10AH to 18AH it is usually just F2 terminals which allow
greater current to pass through them. Make sure you order a battery with the correct
terminal size. Otherwise you may need to return the battery or buy separate terminal clips
to convert F1 terminals into F2 terminals. F1 Terminal width: 3/16″ (0.187″, 4.8mm)
F2 Terminal width: 1/4″ (0.25″, 6.35mm) If you don’t have a battery to refer to, don’t
worry. You can find this information from the manufacturers documentation plus it is
usually on the diagram found somewhere on the control panel. In our case the diagram
is located inside the door of the panel. Here you will find valuable information regarding
minimum and maximum voltage/amperage requirements The diagram should show you the minimum battery
requirements for the device. In our example the minimum requirement is a 12V, 4AH battery.
Our diagram also indicates that you need a 12V, 17.2AH Battery to achieve 24 hours of
battery runtime if the power is out. In our case we are only concerned with burglary
situations where the thief may cut the power to the building or alarm and we want to achieve
at least 4 hours of backup power to the alarm. Since we know 17.2AH=24 hours of backup
power for this particular alarm, we can divide 24 by 17.2 to determine how many AH is required
to achieve 1 hour of backup power. (24/17.2 =1.39). We now know that for our particular
device 1.39AH=approximately 1 hour of backup time. We can quickly calculate the amperage
needed based on how many hours of backup is desired by multiplying 1.39 * backuphours
desired. In our case we want 4 hours of bakup power (1.39AH * 4hrs=Approx. 5.5AH). Therefore
we will be looking to replace this battery with a 12V / 5.5AH min. battery Now that we have the specification requirements,
let’s hop over to’s website and find ourselves a replacement battery. Go to Under “Batteries by Device” click on “Sealed
Lead Acid”. This takes us to the Sealed Lead Acid Battery Configurator page. Here we can
shop by brand and model number. In our case we don’t want to limit our options therefore
we will search by more technical requirements (chemistry, voltage and capacity). In order
to do this we will click “Search by Specification”. This takes us to the specification search
tool where we increase our search options. Now we can search by Application, battery
type, brand, voltage and capacity. I’m going to select “Alarm System” under application,
I will leave type and brand blank, I will select 12 Volt and set a minimum capacity
(Ah) to 4 with a maximum capacity of (10). This will give us a broader range of options
and if the price is within budget we may end up purchasing a larger capacity battery. The
results can now be sorted by brand, part number, capacity, dimensions, price and so on. For the purpose of this video I will sort
by price to find the most affordable 12 Volt 5.5 Ah battery. Now we have some great options.
Verify the dimensions and terminal type. I want an F1 terminal. I see the Amstron and
Power Sonic batteries are equal options for the same price. I will select Amstron since
I’m more familiar with this brand and notice the part number includes “F1”, this helps
us verify it is in fact an F1 terminal. Click the part number to view the product page and
we are ready to make a purchase. Another quick side note is if we go back and
sort by part number we will see some that read 2xAP-1250F1,4xAP-1250F1, 8xAP-1250F1,
etc. What this means is you can buy a 2 pack, 4 pack, or 8 pack of this battery and get
a little discount for buying in bulk. Now we’ve ordered our Amstron AP-1250F1 sealed
lead acid battery. We will go back and replace the old battery with this new one making sure
the positive and negative cables are installed correctly. Be sure to contact your local Hazardous
Waste Recycling Center to dispose of the old battery. This concludes our video on replacing your
12 volt backup battery for a home or business security alarm. This video was brought to
you by

17 Replies to “How to replace home alarm battery”

  1. You need to change the name of this video to how to buy one of our batteries. You don't actually explain how to change the battery.

  2. I believe the math is wrong. In the example given, 17.2 amps in a 24 hour period equates to 17.2amps/24hours = 0.72 amps/hr…not the inverse.

  3. I have changed my alarm battery, but the problem still persist, triggering the alarm once a while in couple of days, until I just press any random button.. Please help.

  4. Ah = amp-hours, not amps. Short out a 7Ah battery and you'll get a damned sight more than 7 amps!

    Ignoring Peukert's law for a moment, a 7 Ah battery will put out 7 amps for 1 hour, 1 amp for 7 hours, half an amp for 14 hours, and so on.

    When you brink Peukert's law into play you find the Ah rating is typically based on 20 hours, so it'll put out about 300mA for 20 hours. The higher the current draw, the lower the capacity (so you'll get more than 7Ah if you draw less than 300mA, less than 7Ah if you draw more than 300mA).

    Also, as zx3zx4 pointed out, the formula is wrong. Using your formula (1.39Ah per hour) results in 1.39×24 = 33.36Ah for 24 hours' runtime, even though the panel states 17.2Ah will do. The correct multiplier to use in the formula would be 0.717Ah per hour.

  5. Good info to know if (like me) you inherited one of these systems when you bought the house and were not involved in the original purchase or installation.  Sure, replacing a battery is not difficult, but it is nice to have the basic info about what to look for easily available.

  6. This is one of the few videos that explains the need to pay attention to the F1 or F2 size clip. Thanks for pointing that out, so I could order the correct replacement.

  7. Beware. Math in this vid is incorrect, as others have noted. Here's a simple way to do it correctly. The total charge in a battery is in Amp-hours (or Ah for short), not Amps as the presenter keeps saying. It is a current times the time the current is drawn. To get Amps from Amp-hours, divide the charge by time. So .6A drawn from a 17.2Ah battery will last 17.2Ah/0.6A=28.7hours. Pay attention to the units: the Amp in Amp-hours cancels the Amp in the denominator leaving Hours. Another: Want the 17.2Ah battery to last 24h. How many Amps drawn? 17.2Ah/24h. Hours cancel, leaving the Amps; it is 0.72A.

  8. This was a good video on how to determine which replacement battery to purchase, however there are no instructions given for actually replacing the battery. Title is misleading.

  9. I love how a video on "How to replace a home alarm battery" wasn't actually about that, but about shilling your website's search tool feature, and some extraneous information that no one actually cares about. You didn't even actually show "how to replace home alarm battery". Downvoted.

  10. Works great>>> and was able to program my own keyfobs with this thing. I have to replace a keyfob about once a year. I am constantly dropping them and eventually they quit working (battery changes don't help). You can find the fobs here for about $17. Which is about $30 less than what my alarm company wants for one that they program. I also found a bunch of old keyfobs in the system that I was able to remove.

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