If the 12V battery is lead-acid, you should have an inline fuse of appropriate rating
to protect things.
Breadboard isn't necessarily going to like the higher currents from a 12V servo,
everything has its limit.
If the 12V battery is lead-acid, you should have an inline fuse of appropriate rating
to protect things.
Breadboard isn't necessarily going to like the higher currents from a 12V servo,
everything has its limit.