Actually it’s both. You can have as high of a current as you want, if there’s no high enough voltage potential, current simply won’t flow. Any battery can push more than few amps of current easily, but voltage potential is not high enough to push it through your body. In general you are right, minimal amounts of current are enough to cramp a muscle, however it takes a lot of pushing to get to that muscle.
Actually it’s both. You can have as high of a current as you want, if there’s no high enough voltage potential, current simply won’t flow. Any battery can push more than few amps of current easily, but voltage potential is not high enough to push it through your body. In general you are right, minimal amounts of current are enough to cramp a muscle, however it takes a lot of pushing to get to that muscle.
While you are right that it’s not as simple as just current, batteries are typically not AC.