While cordless drills are ideal portable devices, they are not well suited to masonry work. However, for the occasional masonry hole, cordless drills are still adequate.
Cordless drills come in many shapes and sizes.
Voltages start as low as 4.8v and go up to around 18v. However, anything below 12v is not suitable as a power drill. Instead, these are really glorified screwdrivers. However, while more voltage means greater power, it also means that the drill will be heavier. Many people opt for the 12v model as being a happy compromise between weight and performance.