I meant 18 volt battery I'm not going to worry about it anymore though thanks everyone for your help
me50, Perhaps tell what you are thinking of doing with that power tool battery and we may be able to give you some help. Nobody can tell you what amperage will flow without knowing the amount of resistance in the connected circuit. Keep in mind that if you connect a load that has a much lower resistance than the internal battery resistance, you will see the voltage of the battery drop to a much lower level.
Obviously with no circuit connected you have zero current flowing so you could say that 15 volts equals zero amps unless you connect a load to it.
When you connect a load, the amps will be determined by how much resistance the load has to current flow.
When you finally get some amps flowing through a resistance, you will have transferred power from the battery to the load and it can be measured in watts. Watts is a measure of power.
I doubt the manufacturer will tell you much about the amperehour capacity of that battery since you are using it outside of its intended purpose. You would have to take your own measurements with an ammeter in series with the connected load in order to determine the actual amperage that is flowing.
The power tool battery is designed for a definite purpose and using it elsewise is likely to be disappointing.
It is being used as intended. I just wanted to see if it had the same amps as the tool it replaced because it was old and is used as a backup