How many apms (or milliamps) are in a 9-volt battery?
The maximum current that you can draw from a battery depends on the internal resistance and the battery’s voltage. This resistance depends on the battery technology and its internal battery’s condition, with nearly exhausted carbon-zinc cells having a high resistance to current flow and a fresh nickel-cadmium cell a much lower one. Even though the nickel-cadmium cell is the same shape and size and has a lower output voltage, it nevertheless has a higher short circuit current capability. Your typical 9 volt radio battery is not intended for heavy loads and will not deliver much in the way of a short circuit current. Furthermore, short circuiting a battery is a bad thing to do. At best, this quickly discharges the battery and exhausts it to no purpose. You may also permanently damage a rechargeable battery this way. In extreme cases, your battery may explode, spreading corrosive and poisonous material all over the place. If you are asking about the battery capacity, that is measured in a
I may be wrong, and I’ll be keen to see other answers, but I always thought you used the formula V=IxR where V is voltage (in this case 9), I is current (what you want to know) and R is the resistance across the circuit. Without knowing R then I could be a range of values. If you connected a 9v battery to a piece of rubber (ie R is immensely high) then I will be infinitely small. And likewise if you connected it to a piece of copper (R is very small) then the current would be much higher. I think that’s a simplified view of it anyway!!
