These batteries have a long life span and cool down while charging so they come to a charge faster. Ni-Cd batteries were formerly used in a wide variety of applications such as emergency lighting, flashlights and photography lighting.
Nickel Metal Hydride (Ni-MH)
These batteries use hydrogen as an ingredient in the mix and are less toxic to humans, animals and the environment. Ni-MH batteries are commonly used in electric vehicles and telecommunications. These are usually the type of battery that comes to mind when one thinks of rechargeables.
To begin with, lithium batteries are lighter. As batteries can get extremely heavy, that lightness mean more maneuverability and ease in handling. It also increases stability, if you are working at an awkward angle or high up on the wall over a long period of time. They also have a higher charge capacity, meaning that you can go longer between recharges. That can be invaluable when doing a hard-to-reach repair on a roof, in an attic, in the basement or anywhere an outlet is not easily accessible.
To top it off, they recharge much quicker than the other batteries. That means you don't have to suffer through waiting on a recharge when you'd rather be finishing a job.
Put those three together, and that makes them very desirable for use in cordless drills.
Does that make it more expensive?
Lithium batteries can be a bit more expensive than the normal alkaline battery but they last twice as long. As a result, they prolong the useful life of that cordless device.
When it comes time to buy the best lithium cordless drill or other power tools, do your homework. Check out the packaging; take time to read the specifications, to be informed before you buy. Lithium cordless drill reviews are also available online or in your favorite tool magazines, so you can get extra hints or tips before you buy.