Batteries

Batteries (power tool battery packs) are portable power sources that provide autonomous operation for cordless drills, impact drivers, angle grinders, rotary hammers, and other construction equipment. Today, Lithium-Ion (Li-Ion) batteries are the industry standard due to their lack of "memory effect," low self-discharge rates, compact size, and high energy density. They allow tools to deliver consistent power even when the charge level is low. Modern batteries are often part of unified cordless platforms (such as 12V, 18V, 20V, or 36V systems), enabling users to power dozens of different bare tools from the same brand using a single battery, which saves money. When selecting a power tool battery, critical parameters include the operating voltage (which must exactly match the tool's requirements), capacity (measured in ampere-hours, Ah — a higher Ah rating means longer runtime per charge), brand and platform compatibility, and the presence of built-in electronic protection systems against overheating, deep discharge, and overload.