- Remove the Ajax HomeSiren device from its SmartBracket attachment panel.
- Turn off the device to ensure safety during the battery replacement process.
- Loosen the self-tapping screws that secure the back panel of the device.
- Once the screws are loosened, remove the back panel to access the batteries.
- Replace the old batteries with new ones of type CR123A, being careful to observe the correct polarity.
- Only use new and undamaged batteries for your Ajax HomeSiren device. Do not attempt to install used or damaged batteries.
- After replacing the batteries, reattach the back panel of the device and tighten the screws securely.
- Once the back panel is in place, turn on the device and use the Ajax app to check the battery status and ensure the new batteries are working properly.
The battery status is not updated instantly but during the next polling of the devices (by default, every 36 seconds).
Batteries and communication with the hub
Ajax devices use a radio module to communicate with the hub. Depending on the distance between the device and the hub, the level of radio interference, or the presence of physical obstacles, the signal transmission power is adjusted automatically. The signal transmission power affects battery life directly.
The frequency of using the radio module by Ajax devices depends on the interval of polling by the hub and the number of alarms. The more frequently the device responds to central panel pings or transmits alarms to it, the faster the battery will drain. Using the Always Active function in the detector settings also reduces battery life.
Batteries in the glass break detectors
Using an electret microphone, this type of detector reacts to a sequence of sounds typical for breaking glass. When the detector is armed, the microphone monitors ambient sounds, consuming battery power to analyze input noise constantly. If the detector is always active and installed in a place with high noise pollution (near an open window on a noisy street or near working mechanisms), its battery life can be reduced up to two times.
Batteries in the opening detectors
Opening detectors are installed on doors and windows — typically, the places farthest from the hub — where the signal strength is low, and the temperature swings regularly. These detectors register every opening; hence the detector installed on the front door consumes battery faster than the detector installed on the window.
Do not install the detectors on the outer side of doors or windows, or in places where the temperature drops below an acceptable level (-10°C). If the Jeweller signal strength is low (one division), use the radio signal range extender Detector ping interval
Factors that can affect batteries :Â
- 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.
To help Ajax devices battery last longer, use only high-quality lithium cells. If there are several cells in the detector battery, do not install cells of different models, manufacturers, or varying degrees of discharge. Due to the flow of charge between them, just one discharged cell can significantly reduce the life of the entire battery.
| 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
- The battery life is affected by a set of factors, which makes its calculations always approximate.
- Always take into account temperature swings at the installation place of the detectors.
- Do not activate settings that use the detector radio module more frequently, unless it’s necessary. We are talking about the Always Active mode and reducing the detector ping interval.
- Use only high-quality cells from well-known manufacturers. Such cells are more expensive than analogs but last much longer. Replace the whole battery only, using the same type of cells produced by one manufacturer.