Ajax HomeSiren: original replacement batteries
The right batteries for your HomeSiren (indoor siren). The same CR123A type that Ajax pre-installs, so you keep the stated battery life and reliability.
Fit them again within a few minutes: battery cover open, old cells out, new ones in, cover closed. The hub and the Ajax app report by themselves, well in advance, that the battery is almost empty.
Technical specifications
| Battery | |
| Type | CR123A |
| Quantity | 2 pieces |
| For device | Ajax HomeSiren |
| Service life (manufacturer's specification) | up to 5 years |
| Pre-installed type | Yes, original Ajax type |
How to replace the battery
Step by step according to the Ajax manual:
- Take the device off the SmartBracket mounting plate.
- Switch off the device.
- Undo the self-tapping screws.
- Remove the rear panel.
- Replace both CR123A batteries and observe the polarity.
- Put the back panel back and tighten the screws.
- Switch the device on and check the battery status in the Ajax app. The status does not update immediately, but after the next ping (every 36 seconds by default).
Would you like the manufacturer’s original instructions with photos? View the Ajax manual.
Frequently asked questions
Is this the same battery as the pre-installed one?
Yes. Ajax supplies the Ajax HomeSiren with CR123A batteries pre-installed. With the same type you keep the battery life stated by the manufacturer (up to 5 years).
When should I replace them?
Your Ajax app and Hub give a low battery notification well in advance. Then replace all cells at the same time with this exact type. The manufacturer's specification is up to 5 years, depending on use and settings.
How many are in this pack?
2 CR123A batteries, exactly enough for one HomeSiren.
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