a power supply is some thing that converts the power from ac 240v (that is what it is in Australia dont know about the us) to dc 12v because 240v would kill the circuits. It is the same in a pc and laptop power pack.
This will widen your choices of chargers
::Mi4::17.5::::::M03R::HW 3000kv::::::T4::7.5::::::HB Cyclone D4::5.5::
"Why follow, when you can lead?"