Paxton/Patterson Blog

Helpful information about STEM education and CTE programs

Tool Tips: Cordless Drill Terminology

by paxpatnate 11. May 2011 06:23

Dewalt DrillSelecting the right tool for the job is always easier when you know how the tool will be used. Additionally, you will have to be able to make comparisons between different manufactures to make your decision. Today we will share terms associated with selecting a cordless drill. 

Amperage/Amp Hours (Ah) -Represents the amount of Energy a battery can hold. This measurement helps determine how long the battery will power the equipment it is used in. Generally speaking, the more "Ahs" the longer run time.

Capacity - The amount of energy a battery can store. Measured in Amp Hours of Milliamp Hours, this is the length of time the battery can supply the required voltage.

Self-Discharge - The process of a battery releasing its energy without being used. This can occur just by sitting on the shelf. Most batteries self-discharge about 1 to 2 percent each day.

Rated Capacity - Measured in "Ah" or "mAh" capacity is determined by the cell manufacturer. This number is then used to determine run time and is also in warranty policies.

Memory - The term used to describe the capacity loss and subsequent voltage drop in a battery due to constant or repetitious charging and incomplete discharging. This results in a loss of run-time.

Cycle Life - The amount of times a battery may be charged and discharged. Every time a battery is charged and discharged it uses one cycle.

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