Cordless drills are powered by built-in rechargeable batteries. There are three types of technology: Nickel-Cadium (NiCad), Nickel-Metal Hydride (NiMH) and Lithium-ion (Li-ion).
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NiCad batteries are the oldest technology of the three. These batteries are cheaper than the other types, but they have a good life span if they are well maintained. In addition, they are tough and resistant to impact and extreme temperatures, so they are ideal for outdoor use. On the downside, they are heavy, so they aren't comfortable for prolonged use, and they run out faster than other battery types. Ideally, the battery should never drop below 70% charge, other than once a month, when it should be fully discharged. Otherwise, their memory is severely affected, and their lifespan is diminished. They also need to be given time to cool down before being charged, which increases their charging time.
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NiMH batteries are more expensive than NiCAD, but their capacity is often 2 or 3 times greater, and they weigh less. On the downside, they have a rapid self-discharge and are sensitive to extreme temperatures. And, like NiCad batteries, they need to be kept at 70% charge, with a full discharge once a month to maintain them. But, if they&#;re left fully discharged for long periods, the battery will deteriorate rapidly, and its lifespan will be significantly shortened.
Lithium-ion batteries are used in most cordless drills. They can be charged at any time, no matter what charge percentage they already have. They also have no self-discharge, so they won't drain unless you're using them. So, even if you don't use the drill for a long time, it will be ready to use the next time you need it. In addition, Li-ion batteries charge from empty to full power quickly &#; typically within 60 minutes and hold more power for longer than other battery types. Another advantage is that they're lightweight, making drills with this battery type comfortable to use for long periods. And they're better for the environment.
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