How Long 9v Battery Will Last. Nick October 24 2007 652pm 3. How Long Do Batteries Last In a Smoke Detector.
Maybe those big old 6V flashlight batteries were designed to last for many hours and thats why they are big. You could also wire 2 or 3 batteries up to get a much longer battery life time. Normally average AA and AAA last up to 20 years in storage while our 9V lasts up to 10 years in storage.
LA522 Energizer 9V Advanced Lithium Battery.
Energizer EcoAdvanced AA and AAA last up to 12 years in storage. Shelf life varies across our products. Normally average AA and AAA last up to 20 years in storage while our 9V lasts up to 10 years in storage. So over the runtime of 1h a 9V block battery can provide less than 3W while any halfway decent USB supply can give you 10W or more.
