All of the common disposable alkaline batteries from AAA to D are single cells. The exception is the 9v battery which actually has six smaller cells inside of it. [Tom] took a look inside three ...

Our evaluation included extensive discharge tests to find long-lasting alkaline batteries -- including AA, AAA, C, D and 9-volt options. We also considered the cost per battery for each option to ...

Alkaline batteries are the most widely available ... of choice for smoke alarms for a long time. The life span of a 9V battery depends on the quality and the battery brand. The type of smoke ...