How Many Amp In A 9 Volt Battery?

The equation V/R=A (where V=voltage-volts, R=Resistance-ohms, and A=Amperes-amp) can be used to figure the amps at a certain voltage and resistance.

If You short circuit a 9 volt battery (cross the two terminals) with a paperclip, then the voltage will be 9 volts and the resistance will be in the range of .1 ohms. Plug this into the equation and you will get 90amps, which can not be achieved by a current 9v battery! That means the battery will however reach its max possible amps, and cause the battery and the paperclip to get hot, and possibly damage the battery.

This amp rating is limited to the electrical current that the battery can store, and I don't think it would be able to store 90 amps at 9 volts.  Here are the stats of real milli amp hour capacity of common alkaline batteries:
Aaa- 1150mAh
aa- 2850mAh
D- 18000mAh
9v- 595mAh

This is a difficult question to answer because of the way the question is worded. Effectively, there is no correct answer.If you are asking how much current (how many amperes) would flow if the battery were shorted out (have a load of zero ohms connected across its terminals), then the answer would depend on what type of 9 Volt battery you're using, what its state of charge is, and what the temperature is.Generally speaking, though, a typical 9 Volt battery has a fairly high internal resistance. The chemical reactions in the cells cannot happen too fast because of their small size and the current carrying capacities of the various elements within the cells are small with fairly high resistances. So you can't get a large current out of a typical 9 Volt "transistor radio" battery even if you short it out.On the other hand, you may be asking what the capacity of the battery is, measured in Amp-Hours.That, too, will vary depending on the type of battery (carbon-zinc, alkaline, rechargeable NiMH, etc.). It will also be affected by temperature and the load current.At higher currents, the Ah rating will be lower than at lower test currents.I've seen ratings in the range from 300mAh to 600mAh depending on the battery type and conditions of the test.Here's Duracell's PDF for their Pro-Cell line Manganese Dioxide 9 Volt battery:www.duracell.comHere is the PDF for their Alkaline Manganese Dioxide 9 Volt Battery:www.duracell.comThis site doesn't properly implement any way to edit. First, it messed up the links I posted. Then, when I tried to edit them to make them somehow work, it smashed all of the text together, removing all spaces and paragraph breaks. Now, it won't even let me delete this mess.Bummer!

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