Smoke detector / fire alarm battery alarm

These simple devices from the hardware store with the 9 volt block battery have the property of emptying the battery, every minute a short pompous "beeps" from.

Preferably, this happens at night, because then usually the temperatures fall and thus technically conditioned battery voltage.

If you have several devices in different rooms as suggested, it is very annoying to locate the device with the battery alarm at the short beep at night.

Tip:

Place the smoke detectors in the fridge for approx. Every 1-3 months for 10 minutes. The devices with the weak battery then report, you replace them with a new battery, and you have at rest again at night!