How long do Ajax Batteries Last? Ajax Security Systems

Ajax Security Systems battery backup

What you need to know about batteries in Ajax Devices

  • A battery is a device that stores and releases energy through a chemical reaction. The performance of a battery is influenced by the temperature of its surroundings, with lower temperatures reducing the speed of chemical processes and consequently diminishing the battery's capacity.

  • There are two main categories of batteries: disposable and rechargeable. While disposable batteries are commonly used in Ajax devices, rechargeable batteries are employed as a backup power source in hubs and radio signal range extenders. The choice of battery type is determined by the device's design and electronic requirements.

It is crucial to use the correct type of cell for each device battery as specified by the manufacturer. The installation of incompatible cells may result in device malfunction or even permanent damage. Furthermore, while manufacturers declare battery specifications, variations in capacity, output voltage, and defects can occur even among cells from the same batch. To ensure quality and consistency, all cells are tested before being utilized in Ajax devices.

    Batteries and communication with the hub

    Ajax devices use a radio module to communicate with the hub, which adjusts signal transmission power automatically based on factors such as distance, interference, and obstacles. This power level affects battery life. The frequency of radio module use depends on hub polling interval and alarm activity, with more frequent use leading to faster battery depletion. Activating the Always Active function in detector settings also shortens battery life.

    Batteries in the opening detectors

    Avoid placing detectors on the outer side of doors or windows, as this can reduce their signal strength. It's also important to avoid installing them in locations where the temperature drops below -10°C. If the signal strength is low, the use of a radio signal range extender or shortening the detector ping interval can help improve connectivity without draining battery life.

    Factors that can affect batteries : 

    • Detector Ping Interval
    • Ambient temperature
    • Jeweller signal strength
    • Number of alarms
    • Door/Window opening frequency
    • Connecting an external detector

    When and how to replace cells in the batteries

    The Ajax system monitors the battery level in the devices and warns of the need to replace in advance. When the battery is on 10% of the charge approximately, the user receives a notification in the Ajax app, and a message about the malfunction is sent to the security company’s CMS each time the system is armed. Depending on the settings and conditions of use, the owner has to 2 months for replacing the batteries from the moment of notification.

    Ajax Security Systems has formulated this table to show battery charge in their devices and how long they should last. due to various factors such as the ones discussed these periods may vary.

    To optimize battery life for opening detectors, several factors must be considered, including the detector ping interval, ambient temperature, Jeweller signal strength, the frequency of door/window openings, and the number of alarms generated.

    Adjusting the detector ping interval can help conserve battery power, as can avoiding extreme temperatures that can also impact battery performance. Monitoring Jeweller signal strength and taking steps to boost connectivity, such as using a radio signal range extender, can help prevent excessive battery drain.

    The frequency of door/window openings and the number of alarms generated can also impact battery life, with frequently used doors or windows requiring more frequent detector analysis and consequently more battery power. In some cases, external detectors can be connected to the Ajax hub to reduce the load on individual detectors and improve battery performance.


    Quantity, type of cells and estimated battery life of Ajax devices
    GlassProtect 1 × CR123A up to 7 years
    DoorProtect 1 × CR123A up to 7 years
    DoorProtect Plus 1 × CR123A up to 5 years
    MotionProtect 1 × CR123A up to 5 years
    MotionProtect Plus 1 × CR123A up to 5 years
    CombiProtect 1 × CR123A up to 5 years
    MotionProtect Curtain 1 × CR123A up to 3 years
    MotionProtect Outdoor 2 × CR123A up to 5 years
    DualCurtain Outdoor 2 × CR123A up to 4 years
    MotionСam 2 × CR123A up to 4 years
    MotionCam (PhOD) 2 x CR123A up to 4 years
    with Photo on demand toggle disabled

    up to 3 years
    with Photo on demand toggle enabled
    MotionCam Outdoor 4 × CR123A up to 3 years
    MotionCam Outdoor (PhOD) 4 × CR123A up to 3 years
    HomeSiren 2 × CR123A up to 5 years
    StreetSiren 4 × CR123A up to 5 years
    StreetSiren DoubleDeck 4 × CR123A up to 5 years
    FireProtect 2 × CR2
    1 × CR2032
    up to 4 years
    FireProtect Plus 2 × CR2
    1 × CR2032
    up to 4 years
    FireProtect 2 RB 2 × CR123A up to 7 years
    Button/DoubleButton/SpaceControl 1 × CR2032 up to 5 years
    KeyPad 4 × AAA up to 2 years
    KeyPad Plus 4 × AA up to 4.5 years
    Transmitter 3 × CR123A up to 5 years
    LeaksProtect 2 × AAA up to 5 years

    What you need to remember about Ajax devices batteries

    When it comes to home alarm installation, it's important to remember that several factors can impact the battery life of Ajax devices. To approximate battery life, consider factors such as temperature swings in the installation area and the frequency of radio module use, especially with settings like the Always Active mode or reduced detector ping interval.

    • For optimal battery performance, it's crucial to use only high-quality cells from reputable manufacturers, even if they are more expensive. Additionally, replace the entire battery with the same type of cells from the same manufacturer. By following these guidelines, you can ensure your Ajax devices operate reliably and efficiently over time.

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