How Many Amps Does a Nine-Volt Battery Have?

At 8 milliamperes, nine-volt batteries provide 400 to 500 milliampere-hours. Ampere-hour measures the capacity of a battery, whereas amperes measure electric current. An ampere-hour is a unit of measurement for the amount of electric current a battery can supply in one hour before its energy store is depleted.

While a 9-volt battery delivering 400 to 500 milliampere-hours (mAh) should last one hour, other factors, such as heat generated and time elapsed, may result in different outcomes. A milliampere-hour rate is provided given a current rate or a particular testing duration for batteries. Assume eight hours in the absence of a specific time.

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Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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