Duracell Ultra 9V
Ideal for smoke alarms.
Our #1 longest lasting (of alkaline batteries).
Duracell Ultra Hi-Density Core Powercheck 9V Alkaline Batteries is designed with denser, more advanced power ingredients that now compress more power into the same size battery. It is also the only battery that offers Powercheck feature on the battery itself. With that you can now know how much power you have left and maximise the use of the battery to the fullest. With Duralock, a unique power preservation system that helps lock in power, Duracell batteries is guaranteed to stay powered for 10 years until they are in use. It is also the longest lasting alkaline power in virtually any device.