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Cordless Power Tool Battery Guide.




Cordless Power Tool Battery Guide for buying battery powered tools. There is no doubt that when you look to buy a power tool today that you almost certainly look to see if there is a battery powered version. With the advances in batter technology that means pretty much any tool that was previously corded has a battery powered option. As with most things in life not all batteries are made equal and in this cordless power tool battery guide we will look at what the differences are and hope to make sure that you buy the the right tool for the job. The ubiquity of the cordless power-tool





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What Are Amp Hours (Ah)?




One of the most important topics in any cordless power tool battery guide is understanding amp hours usually displayed on the battery or the packaging as Ah.




Amp hours is just a unit of measurement has nothing to do with power and it's a totally different unit than amps. Amps is used to describe amp hours, but those are two completely different things. If a battery has a capacity of at least 4 amp hours, it will be prominently displayed somewhere on the battery, like this one, which is a 5 amp hour.




Amp hours




Amp hours describe the "capable charge" of a battery. If for example you see 5 amp hour (5Ah) on a battery it implies that it can draw 5 amps of power continuously for 60 minutes, before this battery loses power. What needs to be understood though is that this measurement is subject to ideal conditions such as optimum temperature, zero vibration and consistent power. Of course in real world use you are probably not going to have those metrics which is why is described as a "capable charge". In practice the best way to look at amp hours is to think of one battery holding its charge longer than another.




Batteries work in terms of the number of cells that they have. For example, a 18v battery could have five 3.6v and 2Ah cells, connected in series. In terms of voltage you would add up the value of the cells to get the overall voltage, However you cannot do this in terms of amp hours. You would still only have 2Ah with the five cells joined in series