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Customer Rating: - ideal 9-volt batteries
Duracell makes a great battery; and the "CopperTop" version of these 9-volt size batteries does indeed last longer than pervious types of 9-volt batteries by Duracell. These batteries always last a good long time after I install them in a smoke alarm I have.

Of course, these 9-volt batteries can be used in anything that requires them--not just smoke alarms. Moreover, the reclosable storage pack actually does close neat and clean for you so that the batteries remaining inside the package don't get dusty or exposure to any elements if you're outside camping or something.

Use these batteries before their expiration date. The expiration date will always be several years into the future; but some people still have them lying around in a dresser drawer anyway. The problem is not only do they lose their potency; the batteries also begin to corrode.

Do NOT dispose of these or ever place these in or near a fire. They could indeed explode. I wouldn't carry them loose either--they should be protected in their cardboard case or they should be already installed in your smoke alarm, your tape recorder or whatever device you placed them into.

Overall, these Duracell CopperTop 9-volt size batteries are the ones to choose if you need 9-volt size batteries. I highly recommend them for any device that needs 9-volt size batteries.