Put one of these batteries in your ionization-type smoke alarm and you can relax until 2012! This ultra long life lithium 9V battery outlasts all other 9V batteries. It is outstanding for smoke alarms baby monitors carbon monoxide alarms garage door openers security systems clock radios any 9V application at all.
The 9 Volt Lithium Battery Ultralife 5x Longer Life is the by far the most amazing batteries i have seen so far. Ultralife as it should make excelent product and this is one of them.