With so many voltages available, from 9V though 36V currently, it can be tricky to determine what the right one is. To start with, if you already own some cordless power tools, it would be a smart buy to get new tools that run on the same battery voltage and charger system you already have. If you are new to cordless power tools, the first thing you will want to think about the amount you are going to use the tool. For example, most contractor types will look for at least a 18V based system because of the power and run time of the batteries, but the flip side is that the higher the voltage the system, The bigger the tool and the more it cost. Now if you just like to be handy around your home, then a lower voltage tool will mostly likely suite you just fine. There are a large number of tools in the 12-14 volt range that are very reasonable prices and will offer decent performance.