9v Battery Current. If you can only use one single 9V battery I recommend acquiring a high-capacitance capacitor and charging it through a current-limiting circuit then switching it. An ampere-hour measures the amount of electric current a battery can supply in one hour before exhausting its storage of energy.

This will tell you which battery t. This design is 60 years old. Ad Search Graingers Online Catalog.
An ampere-hour measures the amount of electric current a battery can supply in one hour before exhausting its storage of energy.
Zinc-Manganese Dioxide ZnMnO 2 Designation. 211 cubic centimeters 13 cubic inch Jacket. Unless you want something big like a car battery. One is the package type.

