Which battery type is used for cordless power tools?

• A. Lithium Batteries
• B. Lead-Acid
• C. Nickel-Cadmium Batteries
• D. Alkaline

Answer: (C)

Cordless power tools need a battery that can deliver high current quickly and withstand repeated charging without adding too much weight. Nickel-Cadmium batteries meet that need well: they can supply strong discharge currents to start and run motors, tolerate a wide temperature range, and endure many recharge cycles, making them reliable for handheld tools. Alkaline cells are not rechargeable, so they can’t power tools through multiple uses. Lead-acid batteries are heavier and bulkier, which isn’t practical for a portable tool. Lithium-ion batteries are lighter and offer high energy density and modern performance, but nickel-cadmium has long been the standard for cordless tools due to its ruggedness and cost-effectiveness.