Nickel cadmium (NiCad) batteries are widely used and a proven, economical choice. Lithium ion (Li-Ion) batteries are newer technology with a higher energy density. This can mean a lighter weight plus no self-discharge and/or charge memory.
Keyless chucks can be quicker but may not be as secure as a keyed chuck. Chuck capacity indicates the largest diameter bit shaft that a drill's chuck can hold. Many manufacturers have a 'ratcheting chuck' that permits extra tightening of the bit, making it more dependable and stable so it won't skip when working through resistance (using extra torque).
This refers to revolutions per minute when the drill is spinning freely. Drills that can adjust this speed tend to be more versatile. Harder materials or larger bits have to be worked at lower speeds. Conversely, softer materials and smaller bits can be used at higher speeds.
Power ratings from DEWALT® are usually measured in Units Watts Out (UWO). The higher this rating the greater a drill’s speed and torque. Other manufacturers often measure the force a drill produces to turn an object (Max. Torque) but this rating does not factor in speed.
Cordless Drill/Driver, Bare Tool (No Battery), Voltage 20.0, Chuck Size 1/2 In., No Load RPM 0 to 600/0 to 2000, Brushless Motor No, Max. Power 350UWO, Transmission 2 Speed, Clutch Style Adjustable, Handle Type Ergonomic, Battery Included No, Battery Pack Replacement 11A165, Battery Type Li-Ion, Battery Capacity 1.5A/hr., Chuck Ratcheting, Tool Length 7-1/2 In., Tool Weight 2.7 lb., Includes Drill/Driver, Belt Hook, On Board Bit Holder
Cordless Drill/Driver, Bare Tool (No Battery), Voltage 20.0, Chuck Size 1/2 In., No Load RPM 0 to 600/0 to...More