How Many Amps Are in a 9-Volt Battery?

By Staff WriterLast Updated Apr 16, 2020 7:32:12 PM ET
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Nine-volt batteries produce 400 to 500 milliampere-hours at 8 milliamperes. Ampere-hour is a unit of battery capacity, while amperes measure electric current. An ampere-hour measures the amount of electric current a battery can supply in one hour before exhausting its storage of energy.

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While a 9-volt battery should last one hour if supplying 400 to 500 milliamperes (mAh), other factors, such as heat produced and time elapsed, may contribute to different results. Milliampere-hour rates are specified given a current rate or a given time at which batteries have been tested. Assume eight hours if no time is specified.