Need a battery for your Arduino that is high enough to regulate the voltage to down to a solid 5V? Well here comes the 9V Snap to 2.1mm Barrel Plug Cable to your rescue! It allows you to plug in 9V and 7.2V rechargeable batteries to anything with a 2.1mm Barrel jack on it.
The LM1084IT-5.0 is a beast of a +5V voltage regulator! Spawning from the same family as the LM317 (sharing the same pinout), this regulator takes current limitations to a whole new level. Perfect for powering servos and handling the load they generate up to 5A!