People use 14.4-volt batteries for power tools, and most power tool manufacturers, such as DeWalt and Milwaukee Tool, make their own batteries for their tools. There are also generic batteries that are universal and work with different brands.
Depending on the brand, some of the features of a 14.4-volt battery include a battery life of more than two hours, in the case of a Milwaukee Tool battery, and a one-year warranty. Milwaukee Tool batteries also do not have memory, so full power is always available after charging. When looking at DeWalt tools, a 14.4-volt battery comes with a 90-day money back guarantee and a three-year warranty. It also works with the entire line of DeWalt tools that require this battery size.