A lithium ion (Li–Ion) battery (sold separately) powers these cordless drills, which means they weigh less and have a longer run-time than cordless drills that use nickel cadmium (NiCad) batteries.
Style A have a keyed chuck that can be tightened with the included key. They have a variable speed—the further you depress the trigger, the faster the drill rotates.
Style B have a keyless chuck for fast bit changes and an adjustable clutch that lets you adjust the torque.
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