Corded hand tools are supplied with a constant, uninterrupted flow of electricity as long as they are plugged into a power source. Battery-powered hand tools, on the other hand, stop functioning when their battery loses its charge. Quality cordless hand tools can cost more than corded power hand tools and are, as a rule, less powerful than corded electric hand tools. Corded power tools, by definition, require a cord to connect them to a power source. The cord can create tripping or snagging hazards --- and therefore a safety concern --- in a work environment.
Battery-powered hand tools typically employ lithium-ion, nickel-cadmium or nickel-metal hydride rechargeable batteries. Lithium-ion batteries, as well as nickel-metal hydride hand tool batteries, are designed to stand up to around three years of regular use, while nickel-cadmium batteries start rapidly deteriorating after about five years. Nickel-cadmium and nickel-metal hydride batteries will self-discharge in storage, while lithium-ion batteries are not prone to self-discharge as rapidly. Makita's cordless power tools feature 18-volt, 14.4-volt, 12-volt, 9.6-volt or 7.2-volt rechargeable batteries.
Both corded electric hand tools and battery-powered hand tools require a certain level of regular maintenance to perform safely and efficiently. Both types of hand tools should be regularly lubricated to promote fluid movement of parts. The batteries used in battery-powered hand tools should be fully charged and discharged about once per week for optimal efficiency. Storing most types of batteries at lower temperatures helps extend battery life. Cordless power tool battery contact points should be kept clean to promote a steady charge.
Safety is always a primary concern while operating both corded and battery-powered hand tools. Cordless and corded hand tool operators should read their hand tool's instruction manual before attempting to work with the tool. Blades, bits and other attachments should be secured before any power hand tool is operated. Wearing face shields or goggles helps prevent face and eye injury from flying debris while operating corded and cordless hand tools.