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9 volt batteries for your smoke detector and other important devices

How many AA batteries does it take to make a 9 volts battery?

Devices like smoke detectors, alarm clocks, radios, and RC controllers often use 9 volt batteries instead of AA batteries.

That’s because the nine volt battery delivers the required 9 volts in a very compact form factor. The same voltage could be supplied by other batteries (including six AA batteries), but would require far more space. To keep the device as small as possible, the manufacturer uses a 9 volt battery instead.

How long do 9 volt batteries last?

Two factors primarily determine how long 9 volt batteries will last. The first is the capacity of the battery. This is usually measured in mAH, with higher being better. The second is the power draw of the device.

For something that has high power requirements such as an RC controller with an LCD display, you might want to choose a long life 9 volt battery so you don’t have to change it as frequently. Many people prefer a high-capacity lithium 9 volt battery for demanding applications.

How long will a 9 volt battery last in a smoke detector?

The best 9 volt battery for smoke detector use is a new one. Whether you choose lithium, rechargeable NiMH, or 9 volt alkaline batteries, most fire departments suggest that you replace the battery in the smoke detector every six months. The battery may be rated for much longer use in this device, but always having a fresh battery in use ensures safe operation.

It’s also recommended you test you smoke detector regularly. If it ever beeps because of low power, replace the 9 volt battery immediately.

9 volt rechargeable battery options

Devices that have a very high power draw and are used frequently are a great option for switching to a 9 volt rechargeable battery. A 9 volt battery charger and batteries may cost more upfront, but the best 9 volt rechargeable batteries can be charged up to 1,000 times. That can save a considerable amount of money in the long term.

Different 9 volt battery packs

9 volt batteries are sold in different packs to suit different needs. You can buy a single 9 volt alkaline battery, or two-packs for occasional use. If you have a lot of smoke detectors or devices that require multiple batteries, many companies also sell multi-packs.

Keep in mind that if you own a high-demand device that goes through a lot of batteries, you might want to consider a 9 volt rechargeable battery pack to save money in the long term.

9 volt batteries on sale

Another way to save money on a 9 volt battery price is to watch for sales. Best Buy offers competitive regular pricing on batteries, and frequently offers 9 volt batteries on sale.