Question

How long does a dry cell battery last?

Answer 1

Dry cell: It is a metal container that contain electrolyte with a cover of graphite rod with low moisture content. In this carbon rod act as cathode while anode is of Zinc

The duration of dry cell : The dry cell are designed in such a manner, they are active for $8-12$years.

So, The life span of dry cell is $8-12$ years.