Baditude got it all right there!
However, if you'd like to know specifically how to determine a batteries amp limit when you
can find the information, here's how:
You need to research the battery and look for its "C rating." A batteries C rating helps you to figure out how many amps the battery was built to withstand. To find out the amp capacity, you multiply the C rating by the mAh and translate the number into amps. (In case you are unfamiliar with battery terminology, mAh stands for "milliampere hours." It is the standard measurement for charge capacity in most batteries we are concerned with here.)
For example, lets say you have an 18650 battery which says 2600mAh somewhere along the side. You research the brand (ie MNKE, AW, etc) and type of the battery and find that it is rated at 5C.
Now you multiply the mAh by the C rating. 2600 x 5 = 13000.
13000 transcribes into 13amps. The amp capacity for this specific (theoretical) battery is 13amps.
If you don't know the formula, you can use an
Ohms Law Calculator to determine how many amps your setup is generating.
Hope I could help! Good luck!