Stay safe with smoke detectors. They are affordable and cheap.

There is enough information in the internet regarding how to make your home safe. It provides directions and guidelines relating to the installation of smoke detectors in your house, explaining the key places where you should place these detectors.  If you are constructing a building, you can buy your requirement of smoke detectors at wholesale price which provides you with further discounted price.

You would need 9 volt alkaline or carbon-zinc batteries to run most of the smoke detectors. You need to be careful in not letting the battery run out and it is advisable that you change the battery at least every six months. Most of the devices provide you with an alarm when the battery runs low. Never-the-less it has been found that most of the detectors installed in houses have run out of battery power, and remains without a fresh battery. There have been campaigns held to remind people to change the smoke detector battery at regular intervals, and these campaigns have even gone out to the people living in day light saving regions, asking them to change the batteries as they set the clock forward or backward. However to stay safe, it is best that the batteries are be changed every six months.

You should never use re-chargeable batteries in smoke detectors. The charge in these types of batteries do not remain as constant, and the commonly known NiCd and NiMH batteries have a much shorter life compared to the alkaline batteries. More-over, alkaline batteries are cheap and serve its purpose in providing steady power to the detector. The re-chargeable batteries drain off on their own, there-by losing the power capacity. If you use these batteries right after you charge them, they will provide you with more power than the alkaline ones. But as time goes on there will be rapid voltage drop in these batteries, and the transition from charged to the dead stage would be very rapid.

However, there are smoke detectors available in the market which uses lithium batteries. These batteries have been specified to run for 7 to 10 years, by which time the whole detector would need to be replaced. The detectors which run on replaceable 9 volt alkaline batteries are cheap to buy and are mostly found in residential buildings. Many detectors that you buy in the market have a built in light indicator, which comes on if the batteries are missing. There is one popular brand which will not allow you to close the battery compartment unless a battery has been placed in it. There are some which have spring-loaded protrusion which obstructs the attachment holes, preventing the detector to be installed on to the ceiling or the wall, unless the battery is put in its place. Some the local governments in the US do not allow installation of smoke detectors with removable batteries.

For any new construction, most of the building codes do not allow smoke detectors to run on batteries. The codes stipulate that the detectors should be wired to the electrical power of the building, though batteries may be kept installed in the detectors as a power back-up in case the electrical power fails. This is considered to be the best way that you can remain assured that in case of fire, your smoke detectors will set the alarm off for you to take the necessary actions.

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